Restic create backup and set tag with date logic

Also see previous post https://blog.ls-al.com/bash-date-usage-for-naming if you are interested. This post is similar but more specific to restic tagging.

Below is a test script and a test run. At the time of restic backup I create a tag in order to do snapshot forget based on tags.

1
root@pop-os:/tmp# cat backup-tags.sh
2
#!/bin/bash
3

4
create_tag () {
5
  tag="daily"
6
  if [ $(date +%a) == "Sun" ]; then tag="weekly" ; fi
7
  if [ $(date +%d) == "01" ]; then
8
   tag="monthly"
9
   if [ $(date +%b) == "Jan" ]; then
10
     tag="yearly"
11
   fi
12
  fi
13
}
14
create_tag
15
echo "backup policy: " $tag
16

17
create_tag_unit_test () {
18
  for i in {1..95}
19
  do
20
      tdate=$(date -d "+$i day")
21
      tag="daily"
22
      if [ $(date -d "+$i day" +%a) == "Sun" ]; then tag="weekly" ; fi
23
      if [ $(date -d "+$i day" +%d) == "01" ]; then
24
      tag="monthly"
25
        if [ $(date -d "+$i day" +%b) == "Jan" ]; then
26
          tag="yearly"
27
        fi
28
      fi
29
  printf "%s - %s - %s | " "$(date -d "+$i day" +%d)" "$(date -d "+$i day" +%a)" "$tag"
30
  if [ $(( $i %5 )) -eq 0 ]; then printf "\n"; fi
31
  done
32
}
33
create_tag_unit_test
34

35
root@pop-os:/tmp# ./backup-tags.sh
36
backup policy:  daily
37
22 - Fri - daily      | 23 - Sat - daily      | 24 - Sun - weekly     | 25 - Mon - daily      | 26 - Tue - daily      |
38
27 - Wed - daily      | 28 - Thu - daily      | 29 - Fri - daily      | 30 - Sat - daily      | 01 - Sun - monthly    |
39
02 - Mon - daily      | 03 - Tue - daily      | 04 - Wed - daily      | 05 - Thu - daily      | 06 - Fri - daily      |
40
07 - Sat - daily      | 08 - Sun - weekly     | 09 - Mon - daily      | 10 - Tue - daily      | 11 - Wed - daily      |
41
12 - Thu - daily      | 13 - Fri - daily      | 14 - Sat - daily      | 15 - Sun - weekly     | 16 - Mon - daily      |
42
17 - Tue - daily      | 18 - Wed - daily      | 19 - Thu - daily      | 20 - Fri - daily      | 21 - Sat - daily      |
43
22 - Sun - weekly     | 23 - Mon - daily      | 24 - Tue - daily      | 25 - Wed - daily      | 26 - Thu - daily      |
44
27 - Fri - daily      | 28 - Sat - daily      | 29 - Sun - weekly     | 30 - Mon - daily      | 31 - Tue - daily      |
45
01 - Wed - yearly     | 02 - Thu - daily      | 03 - Fri - daily      | 04 - Sat - daily      | 05 - Sun - weekly     |
46
06 - Mon - daily      | 07 - Tue - daily      | 08 - Wed - daily      | 09 - Thu - daily      | 10 - Fri - daily      |
47
11 - Sat - daily      | 12 - Sun - weekly     | 13 - Mon - daily      | 14 - Tue - daily      | 15 - Wed - daily      |
48
16 - Thu - daily      | 17 - Fri - daily      | 18 - Sat - daily      | 19 - Sun - weekly     | 20 - Mon - daily      |

Below is the restic backup script setting a tag and then snapshot forget based on the tag.

As always this is NOT tested use at your own risk.

My “policy” is:

weekly on Sunday
01 of every month is a monthly except if 01 is also a new year which makes it a yearly
everything else is a daily

1
root@pop-os:~/scripts# cat desktop-restic.sh
2
#!/bin/bash
3
### wake up backup server and restic backup to 3TB ZFS mirror
4
cd /root/scripts
5
./wake-backup-server.sh
6

7
source /root/.restic.env
8

9
## Quick and dirty logic for snapshot tagging
10
create_tag () {
11
  tag="daily"
12
  if [ $(date +%a) == "Sun" ]; then tag="weekly" ; fi
13
  if [ $(date +%d) == "01" ]; then
14
   tag="monthly"
15
   if [ $(date +%b) == "Jan" ]; then
16
     tag="yearly"
17
   fi
18
  fi
19
}
20

21
create_tag
22
restic backup -q /DATA /ARCHIVE --tag "$tag" --exclude *.vdi --exclude *.iso --exclude *.ova --exclude *.img --exclude *.vmdk
23

24
restic forget -q --tag daily --keep-last 7
25
restic forget -q --tag weekly --keep-last 4
26
restic forget -q --tag monthly --keep-last 12
27

28
if [ "$tag" == "weekly" ]; then
29
  restic -q prune
30
fi
31

32
sleep 1m
33
ssh user@192.168.1.250 sudo shutdown now