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borg prune visualized
=====================
Assume it is 2016-01-01, today's backup has not yet been made and you have
created at least one backup on each day in 2015 except on 2015-12-19 (no
backup made on that day).
This is what borg prune --keep-daily 14 --keep-monthly 6 would keep.
Backups kept by the --keep-daily rule are marked by a "d" to the right,
backups kept by the --keep-monthly rule are marked by a "m" to the right.
Calendar view
-------------
2015
January February March
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 1 1
5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8
12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15
19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22
26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29
30 31
April May June
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 5 1 2 3 1 2 3 4 5 6 7
6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14
13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21
20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28
27 28 29 30 25 26 27 28 29 30 31 29 30m
July August September
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 5 1 2 1 2 3 4 5 6
6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13
13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20
20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27
27 28 29 30 31m 24 25 26 27 28 29 30 28 29 30m
31m
October November December
Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su
1 2 3 4 1 1 2 3 4 5 6
5 6 7 8 9 10 11 2 3 4 5 6 7 8 7 8 9 10 11 12 13
12 13 14 15 16 17 18 9 10 11 12 13 14 15 14 15 16 17d18d19 20d
19 20 21 22 23 24 25 16 17 18 19 20 21 22 21d22d23d24d25d26d27d
26 27 28 29 30 31m 23 24 25 26 27 28 29 28d29d30d31d
30m
List view
---------
--keep-daily 14 --keep-monthly 6
-------------------------------------------------
1. 2015-12-31 (2015-12-31 kept by daily rule)
2. 2015-12-30 1. 2015-11-30
3. 2015-12-29 2. 2015-10-31
4. 2015-12-28 3. 2015-09-30
5. 2015-12-27 4. 2015-08-31
6. 2015-12-26 5. 2015-07-31
7. 2015-12-25 6. 2015-06-30
8. 2015-12-24
9. 2015-12-23
10. 2015-12-22
11. 2015-12-21
12. 2015-12-20
(no backup made on 2015-12-19)
13. 2015-12-18
14. 2015-12-17
Notes
-----
2015-12-31 is kept due to the --keep-daily 14 rule (because it is applied
first), not due to the --keep-monthly rule.
Because of that, the --keep-monthly 6 rule keeps Nov, Oct, Sep, Aug, Jul and
Jun. December is not considered for this rule, because that backup was already
kept because of the daily rule.
2015-12-17 is kept to satisfy the --keep-daily 14 rule - because no backup was
made on 2015-12-19. If a backup had been made on that day, it would not keep
the one from 2015-12-17.
We did not include yearly, weekly, hourly, minutely or secondly rules to keep
this example simple. They all work in basically the same way.
The weekly rule is easy to understand roughly, but hard to understand in all
details. If interested, read "ISO 8601:2000 standard week-based year".
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