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Backing up a NAS in diff-mode leads to enormous filesizes

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Acronis true image 2014 premium (german version); BUILD: 6673

The differential method means that the new backup should contain all, that differs from the last full backup.
In my case the diff-backups are as big as a full backup. It seems that ATIH recognises each file as different, but believe me, there are only a few that are new.

I'm backing up an NAS (attached to a LAN) on a different mobile disc, that is connexcted via USB3.0.

Where can I see, what ATIH leads to that wrong assumption.

Peter

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