Why might TI2020 Files & Partitions .tibx file for whole of C: be less than half the size of "data selected"?

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I’m trying to create a disk image as “an exact copy of a Windows 7 computer's hard disk, allowing the complete hard disk to be restored in the event of a system crash” (definition of a .tib file).

However, after doing various backups and reading parts of the Userguide it’s not clear to me if I’ve managed to do it correctly (as a .tibx now).

With a 1TB SSD (894 GB registered in both Acronis and Windows Explorer) as the source, and a 3TB internal HDD as the disk to hold the backup file:

  1. the setup process, choosing Disk & Partitions, appeared to refer to the whole of C: (including 0.1GB of System Reserved*) and said there were 701 GB of "data selected" from the 894 GB disk space, with 192 GB free, which agrees with the sizes given by Windows Explorer.
  1. The resulting backup, titled SanDisk… appears to have only 538 GB of Data To Recover (the coloured analysis line total for Pictures+Videos+...+System+Others), and is short of the 701 GB that Acronis backup-setup recognised; so what has been lost? (Assocated Help, titled Backup activity and statistics, doesn’t clarify.)

         Coincidentally, perhaps: the difference 701GB - 538GB = 163GB is only marginally larger than the volume of             System Restore Points on C:. Is that likely to be what’s responsible for the difference?

  1. Further however, Windows Explorer shows that the resulting .tibx file is only 346GB. Has the 538GB of data been compressed?

So it appears that from 701GB on the C: drive I’ve ended up with a .tibx file that I expected to hold all the disk contents but seems to be a little less than half the size of the original source data.

Might I, nevertheless, have successfully created a disk image as “an exact copy of a Windows 7 computer's hard disk, allowing the complete hard disk to be restored in the event of a system crash”, or not? And if not, then what am I doing wrong?

As always, advice greatly appreciated.

*    Incidentally, while Acronis indicated that all of the 0.1GB (100MB) System Reserved partition was full, Windows Disk Management indicated that only 40% of the 0.1GB (40MB) was in use - is this significant?

Thu, 09/23/2021 - 17:34
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mvp

Paul, there will always be a difference between the actual size of the source data and the size of the data captured by Acronis!

There is around 20% size saving due to the default compression used for backups.

There are certain very large system files which are excluded from backups by default because are rebuilt by Windows when booting, i.e. pagefile.sys, swapfile.sys and hiberfil.sys - these can add up to over 20GB size.  Acronis also excludes Windows System Protection (restore point) data by default which again can be very large in size savings.

Other files / file types are excluded by default as shown in the Exclusions panel in the configuration options for the backup task, i.e. temporary & cache files.

Some types of source data can be compressed very well such as documents, text files but other files may already be in a highly compressed state such as videos, music, pictures.

If you have a legacy / MBR system, then the MSR partition may contain some small files / folders otherwise for UEFI systems, this partition is normally empty and boot configuration data is held in the ESP (EFI System Partition) instead.

Thu, 09/23/2021 - 20:03
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truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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Hi Steve,

So it sounds like my backup probably is OK, at least as far as size goes.

Many thanks - Paul

Thu, 09/23/2021 - 21:12