Deduplication factor always at 1.0

[MajorD]

Allo,

I have been using PBS for many months and I still see the Deduplication factor as 1.0.

I do not encrypt the backups and my VMs usually do not have snapshots. My datastore is using iSCSI volumes formatted with ZFS.

Should I expect better deduplication and if yes, what can I do to enable it?

Thanks.

 

[SteveITS]

Just to ask, more than one backup of each VM?

PBS automatically stores one copy of each unique chunk. It can actually be encrypted with the same key, and still work.

How are your GC and prune jobs set?

 

[DerekG]

I have been using PBS for many months and I still see the Deduplication factor as 1.0.

If you are only keeping a single backup then there is nothing to duplicate. Try keeping the last 3 days of backup, then you should see the dedupe working, but then you need to set your GC & prune correctly or your'll fill the Backup store.

Dedupe works by default with multiple copies of the same VM/CT or if you have multiple VMs using the same base OS.