User`s guide

BACKUP
If you specify no output file name, BUP uses the three-character mnemonic
of the input device (for example, DU1). The default output file type is BUP.
2. The next command restores the device-image saveset DL1.BUP on device
MS0 to device DL1:
.BACKUP/RESTORE/DEVICE/VERIFY MS0:DL1 DL1:
3. Backing up logical disks as device images is the same as backing up any
volume as a device image.
To back up a logical-disk file as a device, you must first associate it with a
logical-disk unit (see the MOUNT command). The following command backs
up the logical disk mounted in logical-disk unit 0:
.BACKUP/DEVICE LD0: DU1:
The default name of a logical-disk saveset is the name of the device from
which you make the backup. In this case, the logical disk is backed up onto
device DU1 with the default saveset name of LD0.BUP.
The advantage of doing this is that you can access the files in the logical disk
while it is in the saveset. That is, you can still get a directory listing of the
files in the logical disk and restore them as individual files. The disadvantage
is that you can store only one logical disk in a saveset to be able to access the
files in the saveset.
Figure 2 illustrates this way of backing up logical disks. Note that in this
case, the logical-disk directory becomes the saveset directory; that is, they
become one and the same directory.
Figure 2: Saveset Containing a Disk Backed Up As a Device Image
Saveset Directory Saveset directory
is disk directory
File1
File2
File3
Filen
/DIRECTORY
Does the following three types of directory operations:
• Lists savesets on a backup volume or on a series of backup volumes.
• Lists files in a saveset.
• Lists files within a logical-disk file.
The default of the /DIRECTORY option is to display a directory listing on the
terminal. See the /PRINTER and the /OUTPUT options for descriptions of how
to print a directory listing or put it in a file.
RT–11 Command Descriptions 13