Example--Daily Cumulative, Weekly Cumulative Backups

Table 33-7 shows the most commonly used incremental backup schedule; it is recommended for most situations.

Table 33-7 Daily Cumulative/Weekly Cumulative Backup Schedule

	Floating	Mon	Tues	Wed	Thurs	Fri
1st of Month	0
Week 1		9	9	9	9	5
Week 2		9	9	9	9	5
Week 3		9	9	9	9	5
Week 4		9	9	9	9	5

With this schedule:

• Each weekday tape accumulates all files changed since the end of the previous week (or the initial level 0 for the first week).

• Each Friday's tape contains all the files changed since the first level 0. For the level 9 backups, the previous level 0 or level 5 is the closest backup at a lower level.

• All files that have changed since the lower-level backup at the end of the previous week are saved each day.

• For each Friday level 5, the nearest lower-level backup is the level 0 done at the beginning of the month. Therefore, each Friday's tape contains all the files changed during the month to that point.

• Table 33-8 shows how the contents of the tapes can change across two weeks.

Table 33-8 Contents of Tapes for Daily/Weekly Cumulative Schedule

	Mon	Tues	Wed	Thurs	Fri
Week 1	a b	a b c	a b c d	a b c d e	a b c d e f
Week 2	g	g h	g h i	g h i j	a b c d e f g h i j k