About the backup schedule

System Administration Guide
Chapter 3, Backing up filesystems

Before performing a scheduled backup of a filesystem, you must first set up a backup schedule for that filesystem. Once you create a backup schedule, you only have to insert a media volume and respond to a series of prompts to perform your daily backups; the backup system automatically locates modified files and copies them to the backup media.

The backup schedule defines these characteristics of the scheduled backup:

The length of the schedule cycle (how many days between performing complete backups). The default is 7 days, maximum length is 35 days.
The backup level to use for each backup. See ``Understanding incremental backups''.
Where today (the current date) falls in the backup schedule.
Whether to mount the filesystem if it is not mounted when the scheduled backup is run. See ``Mounting and unmounting filesystems''.
Whether to save the backup history file lists. See Saving backup contents lists.

NOTE: If you are scheduling more than one large filesystem, do not schedule two complete (Level 0) backups of those filesystems on the same day. Complete backups take a long time and can slow down your machine significantly.