User`s guide

BACKUP
If you do not specify a saveset name:
• On a random-access device, BUP looks for the saveset BACKUP.BUP. If BUP
does not find such a name, BUP returns an error message.
• On a magtape, BUP restores the files from the first saveset encountered on
the magtape.
Examples
1. The following command restores all the files in the saveset 28MAY.BUP on
device MS0 to DL1 and verifies the restored data:
.BACKUP/RESTORE/VERIFY MS0:28MAY.BUP/SAVESET DL1:
2. Assuming the saveset 28MAY.BUP contains the file FOO.OBJ, you can restore
that file to device DL1 and verify the restoration by using the following
command:
.BACKUP/RESTORE/VERIFY MS0:28MAY.BUP/SAVESET,FOO.OBJ DL1:
See the /RESTORE and /DIRECTORY options for more information on using
the /SAVESET option.
/[NO]SCAN
Scans each output disk for bad blocks. This is the default during the backup
initialization procedure. /NOSCAN inhibits the bad-block scan on disk output
volumes. Digital recommends that you use /NOSCAN only on disk output
volumes that you know contain no bad blocks, and that you use /VERIFY to
assure a reliable backup.
/SUBSET
Specified with the input file specification, the /SUBSET option allows you to do
the following:
• Create logical-disk images of the files you want to back up
• List directories of logical disks
• Restore/extract one or more files from a logical-disk file
1. Creating logical-disk images of the files you want to back up
You can use the /SUBSET option only on standard RT–11 disks, and not
on BUP-formatted disks or any magtape volume. The standard RT–11 disk
format is not changed, and the disk can continue to be used normally.
You can mount a logical disk created by the /SUBSET option and perform
standard logical-disk operations, such as copying, printing, and deleting files.
The default output device is DK, the default output file name is BACKUP,
and the default output file type is DSK. You can use wildcards in the input
file specification.
RT–11 Command Descriptions 23