Technical data

Using BACKUP
11.15 Backing Up User Disks
date fields are not as recent as the last image backup or incremental
backup in which the /RECORD qualifier was used.
3. Enter the BACKUP command in the following format:
BACKUP/RECORD/SINCE=BACKUP input-specifier output-specifier[/LABEL=label] [/REWIND]
The /RECORD qualifier records the current date and time in the file header
record of each file that is backed up. This information is essential for future
incremental backups. The /SINCE=BACKUP qualifier backs up files dated
later than the last /RECORD backup. The /REWIND qualifier is optional
depending on whether you want to initialize the tape. The /LABEL qualifier
identifies the label of the tape.
Example
The following command is an example of an incremental backup in which
BACKUP saves all files on DRA1: that were modified since the previous
BACKUP/RECORD command and stores them in a save set named
20APR2000.SAV:
$ BACKUP/RECORD/SINCE=BACKUP/RELEASE_TAPE
From: DRA1:[000000...]
To: MIA0:20APR2000.SAV/LABEL=20JUNE
The /LABEL qualifier identifies the volume label of the tape. Also, because
BACKUP is performing an incremental rather than an image backup, it is
necessary to explicitly use the notation DRA1:[000000 . . . ] to specify all the
files on DRA1. The /SINCE=BACKUP qualifier saves all files created or modified
since the last /RECORD backup. The /RELEASE_TAPE qualifier dismounts and
unloads an output tape device after BACKUP writes the save set and before it
performs the action of the /RECORD command.
11.15.5 Performing Incremental Backups to Disk
As described in Section 11.2, an incremental backup of a disk provides you with
an exact copy of only those files that have been created or modified since the last
image or incremental backup in which the /RECORD qualifier was used.
How to Perform This Task
To make an incremental backup to disk, perform the following steps:
1. To perform an incremental backup, you must first perform an image backup
using the /RECORD qualifier (see Section 11.15.2).
2. To determine the date of the last backup that used the /RECORD qualifier,
enter the DIRECTORY/FULL command and the file name. For example:
11–36 Using BACKUP