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Acronis 2013 backup to a flexraid NAS network drive letter error/splitting (error occurred while writing the file)

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If i configure acronis 2013 to send a backup of a harddrive to a flexraid nas drive letter it seems to be splitting the tib into multiple tibs..

The logs seem to indicate "error occurred while writing the file".. Event code: 0x00040003+0x0000FFF0+0x8007003A
and

The specified server cannot perform the requested operation

I cant find anything on this error online.. i cant find any errors on the flexraid nas server.

The destination is of the format \\servername\z\backups

Has anyone ran into this and might know what is going on..

If i backup to a local disk this does not occur.

The split size doesnt occur at any fixed size.. one hdd backup might write the first 69.9 gb to one file then finish off the rest in a 450GB file.. while another might first write 147GB then the rest to a 463GB file.

The job seems to finish with a success message though..

Backup splitting is set to automatic, compression maximum, priority normal.

Thanks in advance.
edit:
seeing these in the event viewer possibly related:

eventid 2017 error : The server was unable to allocate from the system nonpaged pool because the server reached the configured limit for nonpaged pool allocations.
followed by a few min later Reset to device, \Device\RaidPort0, was issued. eventid 129 (warning)
.. its always raidport0 it seems (motherboard hdd controller)

EDIT: i believe whats happening (maybe) is that when flexraid fills one drive with the tib file.. it moves on to the next drive with free space, hence the split..

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I am having a similar problem backing up from a Surface Pro 4 to a NAS comprised of two drives that are set to mirror.  My backups are randomly split into randomly sized tib files.  I used the same arrangement for backing up my Surface Pro 3 with no problems.  The same thing happens with full and incremental backups.  I have set an upper limit on mb/s second in the options, but that did not help.  This causes me to question the integrety of the backups.

Hello Brent,

Backup is split into parts when network connection is interrupted for a moment. WiFi links suffer from this more than wired connections.

The program handles such situations. You will still be able to recover from such backup. You can either run backup validation or simulate recovery scenario by booting into Acronis rescue media and attempt to recover some file from the backup.

Regards,

Slava