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Chapter 5 Backup
until a set number of days has passed. If you set this option and the specified days haven't passed yet, the snapshots
will be kept even if they match the target versions to be deleted.
Timeline-Based
This rule uses a timeline of when the snapshot was created to keep snapshots. Using this rule will keep any
snapshots created at closest to 0 minutes on the hour and 12:00 a.m. (midnight) on the day.
The following example illustrates a scenario of when a snapshot is regularly created during 12:00 a.m. to 11:00 p.m.
for every hour everyday and the default archive rule is used, for 24 hours, 7 days, 5 weeks, 6 months, and 0 years.
Current time: 31st, 11:59 p.m.
Mon
1
1st
12:00 a.m.
8
2nd
12:00 a.m.
15
3rd
12:00 a.m.
22
4th
12:00 a.m.
29
5th
12:00 a.m.
Snapshots created every hour between 12:00 a.m. to 11:00 p.m. today are kept by matching the hour-based rule.
One snapshot per day is also kept for the last seven days by matching the day-based rule. One snapshot on every
Monday is also kept for the last five weeks by matching the week-based rule. One snapshot on every first day of the
month is also kept for six months by matching the month-based rule. If you change the year-based rule from the
default settings, one snapshot on January 1st will also be kept for the specified years.
Tue
Wed
2
3
9
10
16
17
23
24
30
31
31
12:00 a.m.
12:00 a.m.
Thu
Fri
4
5
11
12
18
19
25
26
12:00 a.m.
12:00 a.m.
91
Sat
Sun
6
7
13
14
20
21
27
28
12:00 a.m.
12:00 a.m.
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