Technical data

Using BACKUP
11.5 Understanding Save Sets
When restoring data from tape, if you do not include a save-set name with an
input magnetic tape, BACKUP reads the next save set it encounters on the tape.
(If you specify the input save-set qualifier /REWIND, BACKUP rewinds the tape
and reads the first save set on the tape.)
11.5.2 Files–11 Disk Save Sets
To write save sets on a Files–11 disk, you must include the output save-set
qualifier /SAVE_SET. The /SAVE_SET qualifier indicates to BACKUP that you
want to create a save set, rather than a copy of the selected files, on the output
volume. The disk must be mounted as a Files–11 volume; all volumes in a volume
set must be mounted.
BACKUP can read a Files–11 save set as a Files–11 save set or as a sequential-
disk save set:
• When BACKUP reads a save set as a Files–11 save set, all volumes of the
save set must be mounted. To read a save set that is not located in your
process default directory, you must specify the directory in which the save set
is located.
• When BACKUP reads a Files–11 save set as a sequential-disk save set,
you can mount the volumes one at a time. You must specify the master file
directory [000000] in the save-set specification when reading a Files–11 save
set as a sequential-disk save set.
A save set stored on a Files–11 disk is a standard file, however, and can be copied,
renamed, deleted, or backed up.
11.5.3 Network Save Sets
You can create or read a network save set on a Files–11 disk attached to a remote
node by specifying the node name of a remote node in the save-set specification.
A remote node is accessible to the node you are working on (the host node) over
a network. The network save set must be located on a publicly accessible disk (a
disk mounted from the remote node with the /SYSTEM, /GROUP, or /CLUSTER
qualifier) on the remote node.
Depending on the volume and file protection at the remote node, you may need
to specify an access control string in the network save-set specification. An
access control string includes the user name and password, and has the following
format:
remote_nodename"username password"::device_name:[directory]
Example
The following example creates a network save set on the remote node DOUBLE:
$ BACKUP
_FROM: [MY_DIR]
_TO: DOUBLE"username password"::DBA0:SAVEIT.BCK/SAVE_SET
Omit the access control string if it is not required to gain access to the remote
node, such as in the case of proxy network access. Refer to the DECnet for
OpenVMS Networking Manual for more information about access control strings
and proxy network access.
11–8 Using BACKUP