User`s guide

BACKUP
Using the /FILE option with both the /RESTORE and /DEVICE options
(/RESTORE/DEVICE/FILE) is equivalent to using the /RESTORE option by
itself. This operation restores one or more files from a backup volume saveset.
The following example command restores, with verification, the file image
FIRST.TXT from magtape MS0 to device DL1:
.BACKUP/FILE/RESTORE/VERIFY MS0:FIRST.TXT DL1:
/INITIALIZE
Initializes a volume for use as an output volume in a backup operation.
The BACKUP command backs up data only to BUP-initialized volumes. So, you
should use this option if your backup volume is an uninitialized backup volume
or if you want to reinitialize a previously used backup volume.
Since initialization overwrites any entries in a volume’s directory, BUP examines
an uninitialized disk or diskette backup volume and prompts you for confirmation
before initializing it:
• If the backup volume has a standard RT–11 format (not formatted for BUP
backup savesets), the volume may contain files you wish to keep, and BUP
prompts you with the message:
?BUP-W-Not a BACKUP volume <dev>
<dev>:/BUP Initialize; Are you sure?
If you type Y
RETURN
, BUP proceeds to initialize the volume indicated by the
<dev>. If you type N
RETURN
, BUP prompts you:
Mount output volume in device-name; Continue?
If you mount a new output volume and type Y
RETURN
, BUP continues with
the backup operation. If you type N
RETURN
, BUP returns you to the period
prompt.
• If the output volume is not a valid RT–11 volume, BUP displays a message
indicating that and allows you either to initialize it as a backup volume or to
replace it; for example:
?BUP-W-Volume not RT-11 initialized
DU1:/BUP Initialize; Are you sure?
You can use the /INITIALIZE option with /NOQUERY to suppress the
confirmation messages.
When BUP creates a logical-disk backup file, BUP automatically initializes the
logical disk before it backs up data into it.
The Initialization Procedure
• For random-access volumes, the initialization procedure:
— Clears the directory of the volume and writes information into the home
block (block 1) so BUP can recognize the volume as a backup volume.
RT–11 Command Descriptions 17