Data reuse on incremental backup to another PBS?

C

Chicken76

Well-Known Member
Jun 26, 2017
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So I've just added a second PBS server as a storage for backups in my cluster.
The first backups have been done last night on this PBS and I saw the "INFO: scsi0: dirty-bitmap status: existing bitmap was invalid and has been cleared" message in the logs, which was expected.
Now what's gotten me worried is this: "INFO: backup was done incrementally, reused 773.52 GiB (68%)".
Since this is the first backup on this PBS server, there shouldn't be any data reuse, right? Or am I misunderstanding what 'reuse' means in this context?

I can't test this backup until the weekend (which I will) but do you think I have a valid backup there?
 
there might still be re-use in case chunks already exist server side or are referenced multiple times within a snapshot.
 
I wasn't entirely certain what to make of that cryptic "backup was done incrementally" message either, but I've closely watched the logs during initial backup runs with brand new servers.
PBS writes a lot less than its reading, even in first time runs. I know it compresses on the fly, but PBS's main trick is de-dupe.
Sounds like you're seeing PBS do its thing.
 
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