[SOLVED] Question about backups

[onlineapps]

hi, i have a question abut backup, i have 2 PVE server and 1 PBS server
on PVE i already have backups from my PBS servers, but if i delete PBS server from PVE, and after i added it again, and try to made a backup to PBS, then first backup that is created is full backup, not incremental, seconds backups are already incremented, but why? before i have same VM, why backups not made every time incremental? why after removing and adding PBS i need to made a full backup? PBS don't check VM data if already exist and made incremental backup, or did I mess this up and everything is working as it should?
best regards.

 

[santiagobiali]

hi, i have a question abut backup, i have 2 PVE server and 1 PBS server
on PVE i already have backups from my PBS servers, but if i delete PBS server from PVE, and after i added it again, and try to made a backup to PBS, then first backup that is created is full backup, not incremental, seconds backups are already incremented, but why? before i have same VM, why backups not made every time incremental? why after removing and adding PBS i need to made a full backup? PBS don't check VM data if already exist and made incremental backup, or did I mess this up and everything is working as it should?
best regards.

Hi, Proxmox has a "map" of the changed data in your storage. It's called dirty-bitmap and is created/updated on every successful backup and its relative to that PBS server.
When you delete/recreate the VM or PBS storage in proxmox, this dirty-bitmap is lost and a new one is created. That's why it takes more time.

BUT, a full backup doesn't mean it will takes the storage of a full backup in PBS.¹
According to the feature's page, once the data reaches PBS it is deduplicated, just like an incremental backup.


[1] https://www.proxmox.com/en/products/proxmox-backup-server/features
"Backups are sent incrementally from the client to the Proxmox Backup Server, where data is then deduplicated."