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Help understand incremental backup

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My main drive is C: and its total size is 1.81TB. Total data on the drive is 811GB, free is 1.02 TB

I have completed the first full backup using truem image 2016.  On the backup drive I find one file labled Disk_Full_B1_S1_V1 Its size is shown as 686GB.

Today I started another backup of the C: drive.  I have the options set for incremental  backup only.

The backup starts calculating the time.  This runs for several minutes.  At first is shows 40MB, but as time passes it increases to 2.26GB before I stop it. This can't be an incremental backup of drive C: as it is larger than the size of drive C:.

I do have two other internal disk drives, but they should not be involved with the backup I have chosen. What is going on?

Run Windows 7, 64 bit.

Thanks,

Jim

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I think I see my error. 2.26GB is much small then drive 1.81TB.  Looks as if I got GB and TB confused. 

Sorry for this post.

Jim

No worries. You are correct, 2GB is much smaller than 1TB.  It is normal for incremental backups to be large, but not as large as a  full. Incrementals are designed to just backup the changed data since the last full or last incremental backup.  If you have added or modified large data to the drive (windows updates, new files/folders, etc), they will be reflected in the next incremental backup.