Technical data
Using BACKUP
11.4 Understanding the Backup Interfaces
• Context-sensitive hints
You are prompted for input by a one-line ‘‘hint’’ about the field where the
display cursor is currently located.
• Pull-down help
Choose the pull-down Help menu bar item for more extensive help on a
variety of Backup Manager topics.
11.4.2.2 Getting Started with Backup Manager
To start Backup Manager, enter the following command at the DCL prompt:
$ RUN SYS$SYSTEM:BACKUP$MANAGER
Output from the Backup utility is automatically displayed when an operation
starts. You can suspend output at any time (Ctrl/P) and scroll through it. You
can also use Ctrl/T to display status or Ctrl/C to stop the current BACKUP
operation.
11.5 Understanding Save Sets
When you enter a BACKUP command to save files to a tape, BACKUP writes the
files to a special file called a save set. You can also create a save set on a disk
using the /SAVE_SET qualifier. Save sets are classified according to the media on
which they reside. Table 11–3 lists the types of media that you write a save set
to.
Table 11–3 Save-Set Types
Media Type For More Information
Magnetic tape Section 11.5.1
Files–11 disk Section 11.5.2
Files–11 disk on a remote node
(network save set)
Section 11.5.3
Sequential disk Section 11.5.4
11.5.1 Magnetic Tape Save Sets
Magnetic tape is the most commonly used media for storing BACKUP save sets.
It is less expensive than disk media, and its compact size makes it easy to store.
You can use more than one tape device at a time to save or restore data; this
allows processing to continue on another tape while the one most recently used is
rewinding.
BACKUP treats all magnetic tape files as BACKUP save sets. Because you
cannot use save-set specifications as both the input and output specifiers in a
BACKUP command line, you cannot perform a BACKUP operation from one
magnetic tape to another.
Compaq recommends that you copy magnetic tape save sets to disk with the
BACKUP command; however, you can use the DCL command COPY on magnetic
tape save sets that were created with the /INTERCHANGE qualifier.
Save-set specifications on magnetic tape are limited to 17 characters, including
the period delimiter (.) and file type. The following text is a valid save-set
specification:
WKLY27JAN2000.BCK
Using BACKUP 11–7