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The Acronis backup is greater than the files on the disk

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Hello to all,

I use Acronis long time and I never had problems. The software has always satisfied me. I perform backups using the live cd.
Lately I have found problems in the backup process of my pc.
I have a 500GB disk with Ubuntu 16.04 and Windows 8.1.
I made a backup of the entire disk with all partitions. During the creation of the .tib file Acronis tells me that tib file will occupy 64GB but the software takes a long time in making a copy of my OS, and in the end I find myself a tib file of 230GB. I also did a restore and .tib file works perfectly, just do not understand why Acronis uses of space 230Gb.
Linux is 10GB, Windows is 116GB, but I do with Acronis a good compression so 230Gb has not sense.

Thanks for the support

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Giampiero, welcome to these user forums.

The key to why your Acronis entire disk backup is so large is in the fact that you are backing up your Ubuntu 16.04 partition.

ATIH 2016 is most likely backing up Linux OS partitions by doing a sector by sector backup, hence by including your Ubuntu partition(s), your whole backup is probably being processed as sector by sector.

Instead of doing an entire disk / partitions backup, try doing a backup of all partitions on the disk except any Linux partitions and see what size that gives.  Then do a separate partition backup of just the Linux partitions, where you can exclude the Linux Swap partition if you wish as that isn't needed for recovery.

See KB document: 48458: Acronis True Image 2015: Supported File Systems 

and KB document: 56517: Acronis True Image 2016: Supported Operating Systems

Thanks, I read on the pages you have listed me:
Acronis True Image 2016 does not support Linux operating systems.
Which Acronis product backs up all operating systems, Linux also?

Technically, they all do, with the offline recovery media, but I believe sector-by-sector will always be the result if anything other than Windows paritions are discovered.  

For direct support though, I think that backup 11.7 is more in line... you should contact customer support to be 100% sure though.  Here's the supported OS page for Backup 11.7

https://kb.acronis.com/content/57680