PLANET NAS-3410 - Manual (Page 71)

Each media pool is divided into two sets, the save set and the scratch set.
The save set is consisted of the tapes containing important data which cannot be overwritten. On
the other hand, the scratch set is consisted of the tapes which are free to be overwritten. At the
very beginning, all tapes are empty and locate in the scratch set. When the NAS server backs up
data to a tape, the tape is moved to the save set. After the retention period is passed, the tape
expires and is moved to the scratch set for recycling.
The retention period is the number of days for which the tape must be kept in the save set after it
is last written. You can define the retention period when creating a backup task.
Backing Up Data
To start a backup task immediately, please go to the Backup
ÆTape LibraryÆBackup menu on
the administration page. Click the Backup Now button and specify the following.
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