QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 128)

Snapshot Retention Policy UI Label Description
Time-based Keep for Keep each snapshot for the specified
length of time.
Fixed number Keep the specified number
of snapshots
Keep a fixed maximum number of
snapshots on the NAS. After the
maximum number is reached, QTS deletes
the oldest snapshot when taking a new
snapshot.
Smart versioning Smart versioning Keep a snapshot created during a time
period for a specified length of time.
Examples:
• Hourly: 24 - At the end of every
hour, the earliest snapshot created
that hour becomes the hourly backup.
The snapshot is retained for 24 hours
and then deleted.
• Daily: 14 - At the end of every day,
the earliest snapshot created that
day becomes the daily snapshot. The
snapshot is retained for 14 days and
then deleted.
• Weekly: 5 - At the end of every week,
the earliest snapshot created that
week becomes the weekly snapshot.
The snapshot is retained for 5 weeks
and then deleted.
• Monthly: 11 - At the end of every
month, the earliest snapshot created
that month becomes the monthly
snapshot. The snapshot is retained for
11 months and then deleted.
Important
The maximum number of
snapshots for all time periods
combined is 256.
7. Click OK.
Configuring Pool Guaranteed Snapshot Space
Pool guaranteed snapshot space is storage pool space that is reserved for storing snapshots. Enabling this
feature ensures that QTS always has sufficient space to store new snapshots.
Pool Guaranteed Snapshot
Space Status
Snapshot Storage Location
Disabled Free space in the storage pool
Enabled Pool guaranteed snapshot space until full, then free space in the storage
pool
1. Go to Storage & Snapshots > Storage > Storage/Snapshots .
QTS 4.4.x User Guide
Storage & Snapshots 127