Retention Rules - ACRONIS Backup & Recovery 10 Server for Windows User Manual

For information about using Tower of Hanoi for tape libraries, see Using the Tower of Hanoi tape
rotation scheme.

2.7. Retention rules

The backups produced by a backup plan make an archive. The two retention rules described in this
section enable you to limit the archive size and set the lifetime (retention period) of the backups.
1. Delete backups older than
This is a time interval counted back from the moment when the retention rules are applied. Every
time a retention rule is applied, the program calculates the date and time in the past corresponding
to this interval and deletes all backups created before that moment. None of the backups created
after this moment will be deleted.
2. Keep the archive size within
This is the maximum size of the archive. Every time a retention rule is applied, the program compares
the actual archive size with the value you set and deletes the oldest backups to keep the archive size
within this value. The diagram below shows the archive content before and after the deletion.
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