Confusion over backup filesizes and time

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I am trying to carry out a differential backup of my system disk. Windows 7 64bit tells me that C: uses 269 GB of a 500GB disk. The first full backup by ATI used 396 GB, 2 days ago. Today, I am trying to do a differential backup of the same disk. So far the differential file is about 9GB (but I cannot believe that there has been some much change!) Anyway, ATI informs me that it will be about 3 hours in total to finish. This seems absolutely excessive. I have set ATI to validate the process, and also set it not to backup free space on drive C. I have a disk defragger operating (Diskkeeper), it it reports little fragmentation. Basically, I would be grateful for some advice; do I disable validation of the archives until after the backup, disable my defragger, or just accept that the process will take hours, just to create a differential backup. If I just have to accept that type of wait, I may as well stick to full backups every week or so! I am using a quad core processor with 8GB RAM

Ven, 03/08/2013 - 17:15
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The time taken for a backup has more to do with total size and the type of connection to the backup drive, than with processor speed or RAM.
What is the backup drive and how is it connected?

Defragmenting the disk prior to running a backup will increase the size of a differential or incremental backup, as more sectors will have changed.

Be sure not to select sector-by-sector backup option. It is unnecessary and will add size and time.

Ven, 03/08/2013 - 17:52
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Thanks for your quick response. The backup drive is an internal 2TB SATA, It seems that I should disable the defragger, to be on the safe side. I haven't checked the sector by sector backup option yet, but I will. Thanks again.

Ven, 03/08/2013 - 17:58
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>Windows 7 64bit tells me that C: uses 269 GB of a 500GB disk. The first full backup by ATI used 396 GB, 2 days ago.

I'm confused about the 269GB and then suddenly 396GB?, but in any case these seem massive and IMO can only be accounted for by (perhaps) movie files that not only are huge but are also not further compressible.

My backups are typically 10 times smaller than that, and take only a few minutes, at least using USB 3.0.

If movie files are the culprit, you might consider filtering-out their filetypes from the backups, since there are probably other ways you can acquire them (unless they are home movies of course).

Sab, 03/09/2013 - 16:03