Full backup

iwik

New Member
Oct 7, 2021
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Hi,
just setup PBS and have this question. First backup is always full and any next run is just incremental backup. Is some way possible to have (forced?) full backup on some term? For example once a month or week?
I read somewhere when vm is powered off dirty bitmap can't be used and full backup is done, but looking for better solution.
 

t.lamprecht

Proxmox Staff Member
Staff member
Jul 28, 2015
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shop.proxmox.com
Hi,

just setup PBS and have this question. First backup is always full and any next run is just incremental backup. Is some way possible to have (forced?) full backup on some term? For example once a month or week?
with PBS every backup is a full backup, the index is not a diff to the previous backup but contains all relevant information.

We can use the Content Addressable Storage to optimize the whole thing and only incrementally sent new/changed chunks to the Server.

I read somewhere when vm is powered off dirty bitmap can't be used and full backup is done, but looking for better solution.
No, that's not completely true, the resulting backup is always full independent of the dirty-bitmap usage. We just can compute the changes way faster with a dirty bitmap while we actually need to read the whole disk without it, i.e., when the VM is stopped.
 

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