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Windows 7 SSD backup seems too small

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Hello
I upgraded to ATI 2013 at the same time i bought a new pc . It has an SSD drive of 256GB .
I installed Windows 7 64bit and just installed the drivers and activated windows and nothing else . It was using about 20Gb or so on the SSD.
Well i made a backup and of course ticked the drive to backup and the 100MB resereved part which it partitions under the same drive name ( two ticks) and left ATI at default and backed up to my "My Book" 500GB drive as i have done many times.
Well the back up from the SSD was fast to "My Book" and verified as good but i was surprised to see it was only just over 8GB in size . I didnt use any different compression than the normal setting.
Is the file size likely to be ok ? as i fear a very nasty surprise should i have restore !!
Many thanks to all who can help .

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Because Acronis does not back up the pagefile.sys, and hiberfil.sys files (uses "placeholders" instead), the backup size you are seeing looks normal with the standard compression settings in Acronis.

I have a "clean" Windows 8 64 bit system (350MB SR partition and the OS partition) without any other software except all current Windows Updates, and the resulting backup image file is less than 10GB - reported size of used space from Windows in 21GB.

From my experience, this look okay.

James

Thanks James ,
Thats a weight off my mind to be honest as i didnt fancy installing from scratch again , not with all the programs i have installed now .
i'm sure i wont be the first or last to be a bit worried about the size of the tib file ! but thanks again for the explanation .
After adding Photoshop and Lightroom the tib file did increase to 14GB. And its funny that when using the ATI 2013 boot disk it reports the file size to be saved as around 28GB when the resulting file is much smaller , i guess its just a quirk but i feel more at ease now .

The estimate of the resulting file size is just that, an estimate. The resulting file will vary greatly from one system to another as the files that are being backed up may be of types that are more or less compressible on different systems. Acronis does not know how much compression will be done, as it is only looking at the total file space being used, not at the type of files and the ability to compress them or not.