HELP BACKUP — VMS 5.0
Invokes the Backup Utility (BACKUP) to perform one of the following
BACKUP operations:
o Make copies of disk files.
o Save disk files to a BACKUP save set.
o Restore disk files from a BACKUP save set.
o Compare disk files or files in a BACKUP save set with disk files.
o List information about files in a BACKUP save set to an output
device or file.
o Create and list BACKUP journal files.
Standalone BACKUP is a form of the Backup Utility that is
bootstrapped into main memory rather than running under the control
of the VMS operating system.
For a complete description of the Backup Utility, including
information about the BACKUP command and its qualifiers, as well as
using standalone BACKUP, see the VMS Backup Utility Manual.
Format:
BACKUP input-specifier output-specifier
Additional information available:
Parameters
input-specifier Specifies the input for the BACKUP operation. The input specifier is either a VMS file specification, a BACKUP save-set specification, or a device name. If the input specifier is a save-set specification on disk, it must include the input save-set qualifier /SAVE_SET. DECnet-VAX node names are allowed only in save-set specifications. Wildcards are permitted in VMS file specifications, and in save-set specifications if they are on magnetic tape. output-specifier Specifies the output for the BACKUP operation. The output specifier, like the input specifier, can be either a VMS file specification, a BACKUP save-set specification, or a device name. If the output specifier is a save set specification on disk, it must include the output save-set qualifier /SAVE_SET. DECnet-VAX node names are allowed only in save-set specifications. Wildcard characters are allowed when the output specifier is a Files-11 volume, but are not allowed when the output specifier is a BACKUP save-set specifier or a volume created by a BACKUP/PHYSICAL or BACKUP/IMAGE operation.
Qualifiers
Additional information available:
/ASSIST/BACKUP/BEFORE/BLOCK_SIZE/BRIEF/BUFFER_COUNT
/BY_OWNER/COMMENT/COMPARE/CONFIRM/CRC
/CREATED/DELETE/DENSITY/EXCLUDE/EXPIRED/FAST/FULL
/GROUP_SIZE/IGNORE/IMAGE/INCREMENTAL/INITIALIZE
/INTERCHANGE/JOURNAL/LABEL/LIST/LOG/MODIFIED
/NEW_VERSION/OVERLAY/OWNER_UIC/PHYSICAL/PROTECTION
/RECORD/REPLACE/REWIND/SAVE_SET/SELECT/SINCE/TAPE_EXPIRATION
/TRUNCATE/VERIFY/VOLUME
/ASSIST
/ASSIST (default) /NOASSIST Command Qualifier Allows operator or user intervention if a request to mount a magnetic tape fails during a BACKUP operation. The /ASSIST qualifier causes BACKUP to send messages to operator terminals when a failure occurs. If you specify /NOASSIST, mount failure messages appear on your terminal and are not sent to the operator. Specifying /NOASSIST when BACKUP is run in batch mode has no effect.
/BACKUP
/BACKUP Input file-selection qualifier Selects files according to the BACKUP date written in the file header record by the BACKUP/RECORD command. Use this qualifier with the /BEFORE or /SINCE qualifier, either of which provides the system time value used to determine whether a file is processed. Use the /BACKUP file-selection qualifier only with Files-11 Structure Level 2 volumes. You cannot use /BACKUP with the /CREATED, /MODIFIED, or /EXPIRED file-selection qualifiers, in an image operation, or in a physical operation.
/BEFORE
/BEFORE=time
Input file-selection qualifier
Selects only those files dated earlier than the time specified. The
time entered can be either delta time or absolute time. Specify
these time values according to the rules described in the VMS DCL
Concepts Manual.
BACKUP The date of the last /RECORD operation on that
file
TODAY The current day, month, and year at 00:00:00.0
o'clock
TOMORROW 24 hours after midnight last night
YESTERDAY 24 hours before midnight last night
/BLOCK_SIZE
/BLOCK_SIZE=n Output save-set qualifier Defines the block size, in bytes, for data records in a BACKUP save set. The acceptable range for n is 2048 through 65,534. If you do not specify this qualifier, the default blocking size for a disk save set is 32,528 bytes; for a magnetic tape save set, 8464 bytes.
/BRIEF
/BRIEF Command qualifier Causes the /LIST command qualifier to list the file name, size (in blocks), and creation date for each file. The /BRIEF qualifier is the default action for output produced by the /LIST qualifier. You must specify the /LIST qualifier with the /BRIEF qualifier.
/BUFFER_COUNT
/BUFFER_COUNT=n Command qualifier Specifies the number of I/O buffers to be used in the operation. The maximum valid buffer count is 5. /BUFFER_COUNT=3 is the default value. Specify a value for /BUFFER_COUNT that is larger than the default value only when performing operations using streaming tape drives.
/BY_OWNER
/BY_OWNER[=[uic]]
Input or output file qualifier, or output save-set qualifier
As an input file-selection qualifier, causes files owned by the
specified UIC to be processed. A UIC must either be specified as
octal numbers or in alphanumeric format, in the form [g,m]. Note
that the brackets are required. UIC formats are described in the
VMS DCL Concepts Manual. If this qualifier is specified without a
UIC, the default UIC is the current process UIC. If this qualifier
is not specified, all files on the volume are processed.
As an output file qualifier, causes a redefinition of the owner UIC
for each file restored during the operation. One of the following
options can be selected:
DEFAULT Sets the owner UIC to the user's current default
UIC. This option is the default if the /BY_OWNER
qualifier is not specified.
ORIGINAL Retains the owner UIC of the file being restored.
This option is the default if the /BY_OWNER
qualifier is specified, but no option is selected.
To use this option, the UIC must be yours, or you
must have the SYSPRV user privilege, or you must
be the owner of the output volume.
PARENT Sets the owner UIC to the owner UIC of the
directory to which the file is being restored. To
use this option, the parent UIC must be yours, or
you must have the SYSPRV user privilege, or you
must be the owner of the output volume.
[uic] Sets the owner UIC to the UIC specified. To use
this option, the UIC must be yours, or you must
have the SYSPRV user privilege, or you must be the
owner of the output volume.
As an output save-set qualifier, specifies the owner UIC of the save
set. If the /BY_OWNER qualifier is omitted, the UIC of the current
process is used. To use /BY_OWNER as an output save-set qualifier,
you must have the SYSPRV user privilege or the UIC must be your own.
/COMMENT
/COMMENT=string
Output save-set qualifier
Causes the string supplied to be put into the BACKUP summary record
of the output save set. Enclose the string in quotation marks
("a string") if the string contains a space or nonalphanumeric
characters. A comment can contain up to 1024 characters.
/COMPARE
/COMPARE Command qualifier Causes the contents of the first parameter to be compared with the contents of the second parameter. The first parameter can be a Files-11 file or a wildcard character representing a group of files, a BACKUP save set, or a disk device. The second parameter must be a Files-11 disk file or files, or a Files-11 disk device. Unless you also specify the /PHYSICAL qualifier, the disk volume must be a Files-11 volume. If a file does not compare successfully, an error message reporting this fact is displayed.
/CONFIRM
/CONFIRM Input file-selection qualifier Displays a prompt on your terminal before each file is processed. To process the file, you must reply by entering Y or YES and pressing the RETURN key. All other replies cause the file not to be processed.
/CRC
/CRC (default) /NOCRC Input or output save-set qualifier As an input save-set qualifier, causes the software cyclic redundancy check (CRC) encoded in the save set's data blocks to be checked (/CRC) or ignored (/NOCRC). If you ignore the CRC encoding, you reduce processing time at the risk of increasing data error. As an output save-set qualifier, specifies that software CRC checking code is to be computed and stored in the data blocks of the output save set. To disable CRC checking, use the /NOCRC qualifier.
/CREATED
/CREATED Input file-selection qualifier Selects files according to the value of the creation date field each file header record. Use this qualifier with the /BEFORE or /SINCE qualifier, either of which provides the system time value used to determine whether a file is processed.
/DELETE
/DELETE Command qualifier Specifies that a BACKUP save or copy operation is to delete the selected files from the input volume after all files have been successfully processed. Sufficient user privilege is required to delete files. If used with the /VERIFY qualifier, files that fail verification are not deleted.
/DENSITY
/DENSITY=n Output save-set qualifier Specifies the density at which a magnetic tape save set is recorded, in bits per inch. Use a value that is supported by the magnetic tape drive. If you do not specify the /DENSITY qualifier, the default density is the current density of the magnetic tape drive. You must specify the output save-set qualifier /REWIND with /DENSITY.
/EXCLUDE
/EXCLUDE=(file-spec[,...]) Input file-selection qualifier Excludes files that otherwise meet the selection criteria for a save or copy operation. If you specify more than one file specification, separate the file specifications by commas and enclose the list in parentheses. Do not use a device specification when defining the files to be excluded. You can use most standard wildcard characters, but you cannot use wildcard characters denoting latest versions of files (;) or relative versions of files (;-n). If you specify directory files (files with a file type of DIR), your command will be processed, but the directory files are not excluded (they are processed).
/EXPIRED
/EXPIRED Input file-selection qualifier Selects files according to the value of the expiration date field each file header record. Use this qualifier with the /BEFORE or /SINCE qualifier, either of which provides the system time value used to determine whether a file is processed.
/FAST
/FAST Command qualifier Processes an input Files-11 disk using a fast file scan. The fast file scan reads the index file on the Files-11 disk specified by the input specifier and creates a table of files that match the qualifiers you specified. A fast file scan is most useful when the input specifier includes most files on the volume and file-selection qualifiers (such as those that pertain to date or owner) specify a relatively small set of the files named. To perform a fast file scan, you need write access to the INDEXF.SYS file on the input medium or the input medium must be write-locked.
/FULL
/FULL Command qualifier Causes file information produced by the /LIST command qualifier to be written in the format provided by the DCL command DIRECTORY/FULL. If /FULL is not specified, the default action of the /LIST command is the action supplied by the /BRIEF qualifier. You must specify the /LIST qualifier with the /FULL qualifier.
/GROUP_SIZE
/GROUP_SIZE=n Output save-set qualifier Defines the number of blocks BACKUP places in each redundancy group. The value of n must be from 0 through 100. If you define a value of 0 for /GROUP_SIZE, no redundancy groups are created for the save set. /GROUP_SIZE=10 is the default value.
/IGNORE
/IGNORE=option
Command qualifier
Specifies that a BACKUP save or copy operation will override
restrictions placed on files or will not perform tape label
processing checks. The options are:
INTERLOCK Processes files that otherwise could not be
processed due to file access conflicts. This
option can be used to save or copy files that are
currently open for writing. Use of the INTERLOCK
option requires the user privilege SYSPRV, a
system UIC, or ownership of the volume.
LABEL_PROCESSING Saves or copies the contents of files to
the specified magnetic tape volume regardless of
the information contained in the volume header
record. BACKUP does not verify the volume label
or expiration date before writing the save set to
the tape volume.
NOBACKUP Saves or copies the contents of files that are
marked with the NOBACKUP flag by the /NOBACKUP
qualifier to the DCL command SET FILE. If this
qualifier is not used, files marked with the
NOBACKUP flag are processed, saving all
information necessary to recreate the file, except
the actual contents of the file.
/IMAGE
/IMAGE Command qualifier Directs BACKUP to process an entire volume or volume set, allowing you to produce a functionally equivalent copy of the original volume or volume set. To use the /IMAGE command qualifier, you need write access to both the index file (INDEXF.SYS) and the bit map file (BITMAP.SYS) or the input medium must be write-locked. In save and copy operations, you cannot use input file-selection qualifiers with the /IMAGE command qualifier. All files on the input disk volumes are saved or copied. In restore and copy operations, every file is restored or copied. The output volume must be mounted using the /FOREIGN qualifier. The new volume is a functionally equivalent copy of the input volume; however, the file placement will change. An image restore or copy operation initializes the output volume or volume set. The initialization data comes from the save-volume summary record of the input volume, unless the command qualifier /NOINITIALIZE directs BACKUP to initialize the output voume using volume initialization data that already exists on the output volume.
/INCREMENTAL
/INCREMENTAL Command qualifier Allows you to restore a disk volume from a series of incremental save sets. When processed correctly, the output disk volume will contain the same files it contained when the most recent incremental save operation was performed. Files that were deleted in the period in which the incremental backups were performed are not created on the output disk volume. The /INCREMENTAL qualifier is valid only in restore operations. The output specifier must specify a device only; file specifications are not allowed. When the /INCREMENTAL qualifier is specified, files are restored using the /BY_OWNER=ORIGINAL qualifier.
/INITIALIZE
/INITIALIZE /NOINITIALIZE Command qualifier Initializes an output disk volume, making its entire previous contents unavailable. This qualifier is only valid when used with the /IMAGE qualifier in restore or copy operations, or when writing to a sequential-disk save set. The default is /INITIALIZE for Files-11 volumes and /NOINITIALIZE for sequential-disk volumes.
/INTERCHANGE
/INTERCHANGE
Command qualifier
Directs BACKUP to process files in a manner suitable for data
interchange (software distribution), by excluding information that
would prevent other utilities or sites from reading the BACKUP save
set. The effects of the /INTERCHANGE qualifier are as follows:
o Directories not selected as files are not copied.
o Access control lists are not copied.
o Block size on magnetic tape is limited to 8192 bytes.
o Normal error recovery is used to write magnetic tapes so that
there are no bad records on the resulting magnetic tape.
/JOURNAL
/JOURNAL[=file-spec] Command qualifier Specifies that a BACKUP save operation is to create, or append information to, a BACKUP journal file. The BACKUP journal file contains an on-disk record of BACKUP save operations and saved files. The /JOURNAL qualifier can also be used with the /LIST qualifier to list the contents of the backup journal file. Do not specify an input or output specifier with a BACKUP/JOURNAL/LIST command.
/LABEL
/LABEL=(string[,...]) Output save-set qualifier Specifies the one- to six character volume labels for the magnetic tapes to which the save set is written. If you do not specify the /LABEL qualifier, BACKUP uses the first six characters of the save-set name as the volume label of the first tape. If the save set continues to another tape, and you did not specify a volume label for the tape, BACKUP uses the first four characters of the previous tape's volume label followed by the volume number of the tape. For example, if the first tape in a save set is labeled AAAABB, the second tape in a sequence is labeled AAAA02, and the third tape is labeled AAAA03.
/LIST
/LIST[=file-spec] Command qualifier Lists information about a BACKUP save set and about the files in a save set. This list can be displayed on your terminal or written to a file. You can use this qualifier with any operation (save, restore, copy, compare, or journal). If /LIST is specified by itself (not in conjunction with another operation), the input specifier must be a save set, and no output specifier can be specified. Either the /BRIEF or the /FULL command qualifier may be used with /LIST. If neither is specified, the default is the action provided by /BRIEF. Do not use /LOG together with /LIST when the output for /LIST is directed to the terminal; you will receive confusing output.
/LOG
/LOG /NOLOG (default) Command qualifier Causes the file specification of each file processed to be displayed (/LOG) or not displayed (/NOLOG) at the terminal during the operation. The default is /NOLOG.
/MODIFIED
/MODIFIED Input file-selection qualifier Selects files according to the value of the modified date field in each file header record. Use this qualifier with the /BEFORE or /SINCE qualifier, either of which provides the system time value used to determine whether a file is processed.
/NEW_VERSION
/NEW_VERSION Output file qualifier Creates a new version of a file if a file with an identical specification already exists at the location to which the file is being restored or copied. The new file is created with the same name and type and a version number one higher than the highest existing version. By default, BACKUP does not restore a file with the same file name, file type, and version number as a file that already exists in a directory. Rather, BACKUP issues an error message and does not restore the file. The /OVERLAY and /REPLACE qualifiers also override this default, but produce different results than the /NEW_VERSION qualifier. Because this qualifier causes version numbers to change, do not use the /NEW_VERSION qualifier with the /COMPARE or /VERIFY qualifier.
/OVERLAY
/OVERLAY Output file qualifier Writes over an existing file when an identically-named file is encountered during the restore operation. If the identically-named files are not the same size, the file is extended (when the file being restored is larger) or retains its allocation (when the file being restored is smaller). By default, BACKUP does not restore a file with the same file name, file type, and version number as a file that already exists in a directory. Rather, BACKUP issues an error message and does not restore the file. The /NEW_VERSION and /REPLACE qualifiers also override this default, but produce different results than the /OVERLAY qualifier.
/OWNER_UIC
/OWNER_UIC[=[uic]] Input or output file qualifier, or output save-set qualifier As of Version 5.0 of the VMS operating system, the /OWNER_UIC qualifier is superseded by the /BY_OWNER qualifier. The /BY_OWNER qualifier is synonymous with /OWNER_UIC. DIGITAL recommends usage of the /BY_OWNER qualifier. You can, however, continue to use the output save-set qualifier /OWNER_UIC. As an output save-set qualifier, specifies the owner UIC of the save set. A UIC must either be specified as octal numbers or in alphanumeric format, in the form [g,m]. Note that the brackets are required. UIC formats are described in the VMS DCL Concepts Manual. If the /OWNER_UIC qualifier is omitted, or if /OWNER_UIC is specified without a UIC, the UIC of the current process is used.
/PHYSICAL
/PHYSICAL Command qualifier Specifies that the BACKUP operation is to ignore any file structure on the volume and to process the volume in terms of physical blocks. A save set written with the BACKUP/PHYSICAL command must also be restored using a BACKUP/PHYSICAL command. For physical copy operations between disks, the output disk must be the same type of device as the input disk. For physical save operations between disks, the output disk must be the same type of disk as the input disk or a larger-capacity disk. For physical restore operations between disks, the output disk must be the same type of device as the disk from which the save set was created. For all physical operations, the output disk must not have a bad block in any location that corresponds to a good block on the input disk. (This restriction does not apply to RA-series disks.)
/PROTECTION
/PROTECTION[=(code)] Output save-set qualifier Defines the protection to be applied to a save set on a disk or to a magnetic tape volume. The code indicates the type of access (read, write, execute, and delete) available to the four categories of users (system, owner, group, and world). If the save set is written to either a Files-11 disk or a sequential disk, and the /PROTECTION qualifier is not specified, the default is the process default protection. Protection information applies to all save sets stored on a tape. You must specify the output save-set qualifier /REWIND when you specify the /PROTECTION qualifier for a tape. (If you do not specify /REWIND, the protection information, if any, on the volume header record is not changed.) If you do not specify the /PROTECTION qualifier when you specify the /REWIND qualifier, BACKUP applies no protection to the tape. If you specify /PROTECTION, any protection categories that you do not specify default to your default process protection.
/RECORD
/RECORD Command qualifier Records the current date and time in the BACKUP date field of each file header record once a file is successfully saved or copied. If /RECORD is not specified, the BACKUP date field of each processed file remains unchanged. This command qualifier can be used only with Files-11 Structure Level 2 volumes. To use the /RECORD qualifier you must either own the file or have SYSPRV privileges. You cannot use the /RECORD qualifier with the /DELETE qualifier.
/REPLACE
/REPLACE Output file qualifier Allows a file to be replaced when an identically named file is encountered during a restore or copy operation. BACKUP deletes the existing version of the file and processes the new file with the same version number. By default, BACKUP does not process a file with the same file name, file type, and version number as a file that already exists in a directory. Rather, BACKUP issues an error message and does not restore the file. The /NEW_VERSION and /OVERLAY qualifiers also override this default, but produce different results than the /REPLACE qualifier.
/REWIND
/REWIND /NOREWIND (default) Input or output save-set qualifier As an input save set qualifier, causes the input tape reel to be rewound (/REWIND) or not rewound (/NOREWIND) to beginning-of-tape (BOT) before BACKUP searches for the save-set name specified in the input specifier. As an output save set qualifier, specifies that the output magnetic tape is to be rewound and initialized before the save operation begins (/REWIND) or that the tape is neither to be rewound nor initialized before the save operation begins (/NOREWIND). Initializing the tape removes access to any data that previously resided on the tape. If you want to start processing at the BOT, and the magnetic tape is already positioned beyond the BOT, you need to specify /REWIND. Otherwise, the magnetic tape begins (or resumes) processing from the logical end-of-tape (EOT) marker. Use the /[NO]REWIND qualifier for magnetic tape save sets only.
/SAVE_SET
/SAVE_SET Input or output save-set qualifier Defines the input or output specifier as a BACKUP save set. Normally, BACKUP treats specifiers that refer to disk files as Files-11 files and specifiers that refer to tapes as BACKUP save sets. The /SAVE_SET qualifier must be specified when the input or output specifier is a BACKUP save set on a Files-11 disk.
/SELECT
/SELECT=(file-spec[,...]) Input save-set qualifier Selects the specified files for processing. If you specify more than one file, separate the file specifications with commas and enclose the list in parentheses. Do not use a device specification when defining the files to be selected. You can use most standard wildcard characters, but you cannot use wildcard characters denoting latest versions of files (;) or relative versions of files (;-n).
/SINCE
/SINCE=time
Input file-selection qualifier
Selects files dated equal to or later than the time specified. The
time entered can be either absolute time or delta time. Specify
these time values according to the rules described in the VMS DCL
Concepts Manual. You can also specify the time using one of the
following options:
BACKUP The date of the last /RECORD operation on
that file
TODAY The current day, month, and year at
00:00:00.0 o'clock
TOMORROW 24 hours after midnight last night
YESTERDAY 24 hours before midnight last night
/TAPE_EXPIRATION
/TAPE_EXPIRATION=dd-mmm-yyyy Output save-set qualifier Writes the date on which the tape will expire to the volume header record. The output save-set qualifier /REWIND must be specified with the /TAPE_EXPIRATION qualifier. DIGITAL recommends that you specify an expiration date whenever you create a BACKUP save set on magnetic tape using /REWIND. Daily BACKUP tapes should expire in seven days, weekly BACKUP tapes should expire in one month, and monthly BACKUP tapes should expire in one year. Specify the date in absolute time format, according to the rules described the the VMS DCL Concepts Manual. If you do not specify an expiration date, today's date is written to the volume header record when you perform a save operation using /REWIND.
/TRUNCATE
/TRUNCATE /NOTRUNCATE (default) Command qualifier Controls whether a copy or restore operation truncates an output file at the end-of-file when creating it. By default, a copy or restore operation uses the allocation of the input file to determine the size of the output file.
/VERIFY
/VERIFY Command qualifier Specifies that the contents of the output specifier be compared with the contents of the input specifier after a save, restore, or copy operation is completed. If a file does not compare successfully, an error message reporting this fact is displayed.
/VOLUME
/VOLUME=n Command qualifier Indicates that a specific disk volume in a disk volume set is to be processed. The /VOLUME qualifier is only valid when used with the /IMAGE qualifier. Using this qualifier allows you to perform BACKUP operations on a disk volume set when you have only one disk drive with which to perform BACKUP operations.
Examples
1. $ BACKUP
_FROM: DBA1:[*...]
_TO: MTA0:13NOVBAK.BCK,MTA1:/LABEL=(DLY101,DLY102)
This BACKUP command saves the entire contents of the disk DBA1
onto a multireel tape save set. This command does not initialize
the first tape in the save set, but does initialize subsequent
tapes. The first tape in the save set must contain the label
DLY101 in its volume header record; the second tape in the save set
must contain the label DLY102 in its volume header record.
2. $ BACKUP [PLI.WORK]/SINCE=YESTERDAY/MODIFIED [PLI.SAV]
This BACKUP command copies selected files in the directory
[PLI.WORK] to the directory [PLI.SAV]. Only those files that have
been modified since 24 hours preceding midnight last night are
processed. Note that the /MODIFIED qualifier is not required, as
its action is the default when the /SINCE qualifier is specified.
3. $ BACKUP DBA2:[PLI.WORK]*.*; DBA3:[SAVE]23MAR82.BCK/SAVE_SET
This BACKUP command saves the highest version of each file in
directory [PLI.WORK] in a disk save set on DBA3. The /SAVE_SET
qualifier is required because the output save set is on a Files-11
medium.
4. $ BACKUP/PHYSICAL DYA0: DYA1:
This BACKUP command copies the entire RX02 floppy disk mounted on
device DYA0 to the RX02 floppy disk mounted on device DYA1. Both
devices must have been mounted with the DCL command MOUNT/FOREIGN.
5. $ BACKUP
_From: DB1:[SCHED]*.*
_To: DENVER::DBA2:[SAVE]SCH.BCK/SAVE_SET
This BACKUP command saves all files in the directory SCHED on disk
DB1 at the local node to the network save set SCH.BCK at remote node
DENVER. The /SAVE_SET qualifier is required to identify the output
specifier as a save set on a Files-11 disk.
6. $ BACKUP/LIST DENVER::DBA2:[SAVE]SCH.BCK/SAVE_SET
This BACKUP command lists the BACKUP summary information, the
original BACKUP command used, and the file name, size, and creation
date for each file in the save set created in the previous example.
The /SAVE_SET qualifier is required to identify the input specifier
as a save set on a Files-11 device.
7. $ BACKUP/BUFFER_COUNT=4/IMAGE DBA0: MUA0:SAVE.BCK/LABEL=MON101
This command performs an image save operation using a pool of four
I/O buffers to a magnetic tape cartridge labeled MON101 on a
streaming tape drive.
8. $ BACKUP MTA0:NOV2SAVE.BCK/REWIND [*...]
This command restores all file in a magnetic-tape save set named
NOV2SAVE.BCK to the directory tree from which they were saved. The
/REWIND qualifier directs BACKUP to rewind the tape to the
beginning-of-tape before beginning the restore operation.