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The last backup has been stopped by the user.

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Hello. I am trying Acronis 2015 Update 1 (build 6525) to backup my home NAS (QNAP TS-259) to an external hard drive. I can see the files using the \\ notation and have permissions just fine. The Acronis can detect the NAS, I can select files. I can also select the external HD as destination. Just fine so far.

But once I click "Back up now" green button, the backup start and very quickly it stops with the message "The last backup has been stopped by the user." Of course I did not cancel the backup.

Digging the internet I found the "Unable to create volume snapshot" error in previous version, with same behaviour. I checked the Shadow Volume Service in Windows and it has been started and working. I am using Windows 7 Home Pro, up-to-date.

Despite all this checks, I still unable to perform the backup.
Can somebody help me to find the issue?

Best Regards.

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How much data are we talking about backing up here? If there is insufficient space for the snapshot to be created then the process would fail.

We are talking about 580Gb of data into NAS, and my external drive has 3TB. There is some data in the disk (previous backup with some ZIP files) but I have free space in the external disk for sure. My desktop computer has 500Gb SSD HD, only about 200Gb are free. That's why I want to use Acronis with the external disk! My NAS can grow near 4TB since I have 2x2TB HD. Of course, I need a lot of time to run out of space, but this possible in theory.

Imagine I have a near full NAS with 4TB data: I want to run a backup and split across two or three hard disks, this is very important since I am using RAID 0 (fast but unsafe). My idea is to run a full backup every month and every weekend an incremental backup.
Now I have only 580Gb of data, and this monthly backup and weekly incremental policy can fit a single 3TB hard disk.

I configured Acronis to split the backup files into DVD size, so I expect to use only about 4GB of my local SSD size. For this snapshot size I have enough space! If Acronis Backup wants 580Gb free, this will not be possible. Not to mention 4TB!!

Honestly, I expect to need only about 4-5Gb to store a single file, and split the files while moving the data to external HD. This is the expected behaviour... Not sure if I am asking too much.

Thank you for the quick reply in my post.

Have you looked at how much space System Protection has available? If I understand what you are trying to do correctly I think you are attempting to backup 580GB of data from an attached NAS to an external 3TB HDD. True Image will use the available space on your system disk (500GB SSD) for the VSC of which you say has 200GB free. I would think that you probably has adjusted down the max size of Restore Points in Windows (System Protection) due to the fact that you are running an SSD as your system disk. If you or someone else has you might have to increase the size allotment to get this to work and it still might not work at that.

I am attaching a link to an easy read article about VSS that is very informative. Maybe it will be of some help to you.

http://blog.szynalski.com/2009/11/23/volume-shadow-copy-system-restore/

That's correct. I want to backup 580Gb from my NAS to 3Tb external HD.

I will read about VSS and try to solve my problem.

Thank you

The other option you have here is to Disable the VSS service in Windows services.msc prior to running the backup. True Image uses the VSS service so that the user can continue to work on the computer while the backup is being completed. The actual snapshot of the disk volume is handled be a module called snapman.api, at least that is what I have been able to determine so far. Per the Knowledge Base the backup of an NAS is limited to folders/files, not an entire NAS which I suspect to mean that the OS if any of the NAS cannot be backed up by the application. I could be wrong here of course. Disabling the VSS service would mean that any attempt to use any data being backed up would likely cause an error. It might also mean that machine performance might suffer while the backup runs as well.

I end up with the support, they remote connect and reproduce the problem. They use a small hot fix file for VSS, but nothing change (VSS was not broken) and disable VSS also didn't work. The support was very kind to collect all logs and scale the problem... I will wait. Thanks for all support, and if a solution is provided I will post here to share with community. The initial guest is some problem to backup a large NAS (or any large origin) to a large external HD (or any large destination) with a computer using a small SSD in the middle.

Thanks for the update, keep is posted.