after restore - what will happened with differential Backup? (VM ID problem?)

[celtar]

Hello,

following scenario:
1. A Proxmox server/cluster node failed with a contained VM ID100 (and other VM IDs)
2. the faild Proxmox server/cluster node has to be removed from the cluster so that VM ID100 Number becomes free, otherwise the VM ID100 is blocked for restore
3. Proxmox restore from the Proxmox backup server (with ID100) to another Proxmox/cluster node

Question:
a. If I restore with a different VM ID (e.g. VM ID120, as maybe suggested from cluster node), do I have to recreate all backup jobs (delete old ID 100, add new VM ID120 to backup jobs)? There is an initial backup and then differential backups on the proxmox backup server. Also you have maybe to delete all old VM ID100 manually from the proxmox backup server).

b. If I restore with the original ID100, will the backup jobs continue to work and will the PBS recognise that it was an original backup/restore? In other words, will there be no new initial backup, but will differential backups continue to be generated? Does pbs recognise it is VM ID100?

c. If i manually change the VM ID (is it possible?) later, does PBS recognize this or what will happen with the backup job (initial + differential)?

I can not find this Scenario. Maybe someone can say us if it works or which strategie maybe better?

Thanks and best regards
John

 

[wigor]

as far as i know:
to b)
- the jobs are configured by number, so the backup jobs will be active, if you restore to the same ID.
- the next backup will be a full backup (VM stop/start always causes full backup).

 

[dietmar]

a.) There are no initial or incremental/differential backups - only deduplicated backups.

b.) After stop/start, backup needs to read the whole disks, but backup are still fully deduplicated.

c.) backup data is deduplicated at the server side.