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Drive C shows different total sizes on the different backups

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I backup my C drive several times a week in the two different kinds of backup. When on the main page I highlight a backup it shows a different size (Total Size for C:). Can anyone explain that for me? Thank you!

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If your backups are exactly the same the file output should be nearly identical (perhaps slightly different based on compression and the fact that they will also not be running at the exact same time so modifications can take place between the backup times).

Can you provide screenshots of the backup types?  Size will vary if: 

1) one backup has different exclusions than the other

2) the backup types are different (i.e. incrementals vs differentials) 

3) how long the retention policy is for each back

4) how often each backup is actually run (for instance if the 1st one runs mon, wed, fri, sun and the other on Tues, thur, sat the changes in each backup will be different as well)