Retention Strategy

1

Hello.
I use Urbackup it is a very good tool.

But i am lost whith policy retention.
Actually my setings are

intervalle pour la sauvegarde incrémentielle de fichiers:12 hours
Intervalle pour la sauvegarde complète de fichiers: 7 days
Nombre maximal de sauvegardes fichiers incrémentielles: 7
Nombre minimal de sauvegardes fichiers incrémentielles: 2
Nombre maximal de sauvegardes fichiers complètes: 4
Nombre minimal de sauvegardes fichiers complètes: 2

I notice that i have actually whith this policy about 1 month retention
Whith 1600Go maximum used on my backup store (on a 3TB Disk)

i would like change my policy fir having better retention

Ideally i would like to have

  • 2 backups per day during 1 month (inc ?)
  • 1 backup per month during 12 Month (full ?)

How can i set my policy to have this ?
I think
interval increm : 12 hours
interval full : 31 days
Mini incr : 62
max inc : 62
Mini full : 12
Maxi Full : 12

Do you think 3TB will be enough for this policiy ?

2

Hello
No answer for this question ?

3

A little math is necessary:
Full Backup = X (Gb: Current + growth rate over last year / 12)
Incremental = Y (Gb: Max Size Changes)
If (X * 12) + (Y * 62) = Z
If Z > 3,000 then 3TB isn’t adequate

Yes, there is some wiggle room. But do you want to plan your backups around wiggle room?

4

Thanks a lot for answer
I have a another disk about 3To

I could do a jumbo disk
Do you think i Can extend backup storage to add disk without Lost backup data ?

Best method was mdraid jbod or lvm aggregate 2 PVS

5

You could use the file backups (incremental) for the daily ones.
Then use image backup (full) for the monthly ones.

This allow more flexibility in configuring the backup.

6

For retention strategies like you are thinking about, perhaps go away from full/inc and use the archival feature. Think about how long and how often you want to archive data for and then add archival rules for that?