Asus TS Mini - Manual (Page 82)

82 HOME SERVER TS mini
Backup
The Backup settings page allows you to specify start and end time
for backing computers on the home network, configure the number
of months, weeks, and days to keep backups on the home server,
and clean up old backups manually.
Click the Help button on the lower right corner for detailed
information about how to perform the tasks on the Backup settings
page.