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Large incremental backups

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Forum Member
Posts: 13
Comments: 36

Many of my incremental backups are almost as large as the full backups when I have not added any new data to speak of.  In the attached example, the last incremental is 25% of the full backup, while some are much smaller.

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Legend
Posts: 109
Comments: 27790

Robert, what version of Windows OS are you using on this computer?

There are many reasons why incremental backups may be much larger than expected.

  • Windows Updates where new build versions are installed, i.e. Win 10 1909
  • Use of disk defragmentation utilities
  • Installation of new applications
  • Use of disk encryption tools

Your screen image growth in the size of your 3 recent full backup images, i.e. from 378GB to 388GB then to 447GB before the 112GB latest incremental file, which suggests that there are some significant changes taking place.

Beginner
Posts: 0
Comments: 4

I've got a related question ... I too have seen where sometimes the incremental is large next to some of the other ones (typically something like 2-5% 'normal' day-to-day, then it will bump up to 20-25%).

I've just finished re-installing ATI2015 so I could mount the backups, I was hoping I would see only the files that were actually backed up in the incrementals, but regardless of which one I mount I see the complete folder structure and all of the files???? So what am I not getting?

Thanks,

Denis.

Legend
Posts: 109
Comments: 27790

Dennis, welcome to these public User Forums.

Sorry but there is no method of seeing just the files backed up in any incremental backup.

Beginner
Posts: 0
Comments: 4

Bummer, makes trying to figure out what the activity is that is causing so much data to appear new!

Forum Hero
Posts: 200
Comments: 4808

Defragging HDDs will cause larger incremental backups when the sector occupied by data is changed (even if the data itself has not changed); behaviour of SSDs is different - the Trim process does not change the sector in which data is located. There is limited defragmentation of SSDs but I cannot say to what extent that involves data being moved to different sectors - it may be less pronounced that is the case with HDDs.

OS updates and driver updates can also cause such bumps.

Ian

Beginner
Posts: 0
Comments: 4

it's an external drive, holds only 'user' data ... so must be something I am doing