PLANET NAS-3410 - Manual (Page 65)

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Delete snapshots if free
space is low If enabled, it will automatically delete the oldest snapshots to
free more disk space when the free space is lower than the
specified percentage.
Snapshot Policy They specify how many hourly, daily, weekly and monthly
snapshots to keep, respectively. If the limit is exceeded, the
oldest snapshot of the same type will be deleted. If not
specified, it will keep the snapshots until being manually
deleted.
Creating Snapshots
There are several ways to create snapshots. One is to create a snapshot manually by selecting a
volume and clicking the Create Snapshot button on the Snapshot
ÆManage page. It will create a
snapshot with a name like manual-20041010.190000, which indicates a snapshot created
manually at 19:00:00 of October 10, 2004. Another method is to set schedules to create
snapshots regularly. Moreover, the NAS server will create snapshots automatically when doing
tape backup, SmartSync and CD/DVD-burning tasks. Then it reads in source data from the
automatically created snapshots, instead of the current active file-system, to prevent the open-file
issue.
Deleting Snapshots
To delete snapshots, check the check-boxes in the List of Snapshots table and click the Delete
icon to delete the selected snapshots. You can make multiple selections to delete several
snapshots at a time. The NAS server will delete the snapshots one by one.
Snapshot Roll-back
Snapshot roll-back is to restore the volume to the state when the selected snapshot was taken.
Snapshot roll-back is useful if most data are lost or destroyed by virus attacks or human errors.
Snapshot roll-back is much faster than restoring from tapes. Please note that the roll-back
operation is dangerous because the whole volume will be restored to the previous state. If you
want to restore only part of the data, please simply copy them from the .snap folders to the current
file-system.
Snapshot Scheduling
To manage snapshot schedules, please open the administration page. Enter the
Backup ÆSnapshotÆSchedule page.
To add a snapshot schedule, either click the Add Schedule icons next to the volume names, or
click on the Add Schedule button on the bottom of the page.
To delete snapshot schedules, check the check-boxes to the right and click the Delete icon.
To modify a snapshot schedule, click the hyperlink of the snapshot schedule in the Schedule