Re: [Bacula-users] Unnecessarily duplicating backups

Hello Ian,

Bacula decides what to backup when the job starts. For differential ones, the mtime and ctime are checked against the start time of the last full backup job. For incremental ones, these times are checked agains the start time of the last full/incremental/differential one.

If you run a differential after a full, then an incremental, but the differential one hadn't finished before the incremental one starts, then the incremental would check the last full one. So you will have both differential and incremental identical.

Best regards,

Ana

On Tue, Jul 19, 2016 at 2:49 PM, Ian Douglas <ian AT zti.co DOT za> wrote:

Hi All

It seems to me that Bacula makes unnecessary duplicate backups.

I have
1. Daily incremental
2. Monthly differential
3. Annual full.

However one of the backups is over 3.5 TB, and the system only manages about
100GB/hour.

So the differential backup (in this case) ran for more than 24 hours. I also
had a others in the queue that pushed the time to when it could get to the
daily incremental to over 2 days later.

So...
1. Bacula did the differential, starting on Saturday.
2. today it did an incremental, for stuff added since Saturday.
3. it then did exactly the same files as in (2) again. I was watching.

I'm assuming this is because Bacula decides WHAT to back up at the time the
job is scheduled, instead of when it is actually run.

Is that correct, or is something else wrong?

thanks, Ian
--
ian AT zti.co DOT za http://www.zti.co.za
Zero 2 Infinity - The net.works
Phone +27-21-975-7273

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What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are 
consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
J-Flow, sFlow and other flows. Make informed decisions using capacity planning
reports.http://sdm.link/zohodev2dev

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