>>>>> On Wed, 23 Nov 2016 04:51:57 +0800, Gi Dot said:
> 
> Hi all,
> 
> The other day I was running a full and differential backup back to back on
> a database server, and I was surprised to see the size of both backups are
> not that far off. The full backup size was about 37G, and the differential
> backup that runs after that was about 30G. Excerpt from the log:
> 
>   JobId:                  521
>   Job:                    DatabaseBackup_Server1.2016-11-19_07.49.07_55
>   Backup Level:           Full
> 
>   JobId:                  522
>   Job:                    DatabaseBackup_Server1.2016-11-19_07.59.04_02
>   Backup Level:           Differential, since=2016-10-23 23:00:02
> 
> Seems like the differential backup was done by comparing the differences
> with the full backup done back in October 23rd, instead of the last full
> backup done just before. Is this even correct? The full backup that it
> compares with was the last full job before I ran the full backup on Nov
> 19th (jobid 521).

I think the problem is that the differential job started while the new full
job was running.  That caused it to choose the old full job for comparison,
even though it didn't back up any files until after the new full job finished
(presumably due to concurrency restrictions).

__Martin

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