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Backup file size question

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Bonjour

I am using Acronis 2011 on a CD to perform backup of the system disk of my Vaio computer.

This computer support one physical disk (450Go) which I have split into 2 partitions:
- virtual disk C containing the system (W7 home premium) and my application softwares
- virtual disk D with data

When starting Acronis to backup C disk I am getting information showing size of data to backup is around 59 Go.
At the end of the successfull backup, when looking to the backup file size (.tib), it comes to be around 173 Go (which may be closed to the C + D data size).

Can someone explain to me why the final backup file is not 59Go?

Thanks

Alain

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The completed backup should be approximately 70% of used space of items/partitions being included within the backup.
Picture files and audio/movie files are already compressed and will be backed up at almost their full size with no further compression.

Recheck your selection of partitions to be included within the backup to make sure only the desired partitions are checked.

Grover, thanks for your answer.

What you say is what I thaugh which is by the way what happen when I backup my main PC the same way with a small nuance:
- on my main PC I am making a backup of C and C is also a physical disk
- on my Vaio, C is just one of the two partitions of the physical disk (In fact there is also a masked partition in order to restore the Vaio to factory setting).

Now
I have choosen "disk backup"
then on the list of partitions I checked only the one corresponding to "system disk" (size 254.2Go and used space 59.32Go)
"sectors backup" NOT selected
then "new archive" option
to be written on the "data partition" virtual disk which is the second part (size 200Go) of my physical disk
and "automatic naming"

...running now for some time...

I will be back when finished

Finished................ ==> mybackup.tib=163 949 960 ko (!) I don't understand.

Which version of Windows?
Is this Sony disk a UEFI OR GPT style disk?

Use Windows Disk Management and look at the sony via the graphical view.
Does it show partitions other than the two you are expecting--system and data?

Hello Grover

I am using Windows 7 Home Premium Service pack 1 updated

In term of disk style I don't know where to find the answer.
The Sony Vaio computer (laptop) was bought end of 2010 and came up with only the (C) partition been visible. There was 2 other hidden partitions (one is "system reserved" very small (100Mo) (Boot?), no name, and the other one is "recovery".
My understanding is that the hidden "recovery" one is factory built to enable returning to factory settings under Sony recovery process.

I created myself the (D) drive (from C free space)and from memory I was not abble to get more than 200Go for this D drive neither to reduce the C one more than around 245 Go, nor to create a 3rd (E) partition one.
This being said, I never noticed until recently the size of the .tib file...and I never (fortunatly may be) had to use the backup file.

I have attached a picture of the graphical view to this post and in that picture I even don't see where I can find 170Go of data to backup.

Thanks

Post Scriptum:
I think I found the cause: I was using an iso copy of the CD I first created from Acronis when I bought it.
When using the original CD one, everything is going fine.
This solves my problem...nevertheless I don't understand why this iso copy was "bad" on the Vaio and ok on my main home-made computer and if I have some time I will investigate what these 170Go are made of.

Thanks for your help and time spent for what may be a personnal error.

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Let's look one step further.
From a command prompt
Type
DISKPART
LIST DISK
SELECT DISK 0
LIST PARTITION

The procedure is the same as this example and let's see what your results produce.
In particular, is this a GPT style partitioning?
http://forum.acronis.com/system/files/resize/mvp/user285/misc/show-disk…

not sure what "GPT style partitioning" means...sorry.

I have attached the result of the commands.
seems not to be GPT style

FYI: my computers are both Windows 7 home premium 64bits

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Your last DiskPart attached shows 5 partitons whereas your Windows DiskManagment attached shows only 4 partitons. The Windows Disk management cannot display partitons which are hidden to it. Thus, it would appear that your backup is including the extra partition which explains why your space estimate does not match actual.

The last attachment also shows your disk to be GPT style partitioning.

You can google on GPT for more info about this type process.
Perhaps other users can asist as I am not a technician nor geek.

Note: as you have GPT style disks, you need to be using version 2013 or 2014.