Error in backup 0x807800C5

I have found another work around that may work with some NAS.  Instead of pointing the backup folder to a network share, I created a VHD on the network share and mount the VHD as a local drive.  Here is what I did:

1. Start Windows 8 Disk Management, under Action, select create VHD.   Put the VHD in the NAS folder where the backup will be stored.   Select either VHD or VHDX (usable only under Windows 8 or Windows Server 2012).   Select Dynamically Expanding type and the appropriate size.  For mine, I created a 300GB VHDX.
2. A new disk will be available under Disk Management and requires initialization, formatting and letter assignment.  After this, you can perform a backup pointing to this drive and see if it works.

To mount the VHD every time the system starts up, create a scheduled task that runs the following windows command script:

1. START "Diskpart" /WAIT %SystemRoot%\System32\Diskpart.exe /s %SystemRoot%\CMD\AttachBackupVHD.script
2. The AttachBackupVHD.script contains the following DISKPART command:

SELECT VDISK FILE="NAS location\Backup.vhdx"

ATTACH VDISK

EXIT

I tested this on an Iomega/Lenovo NASix201 and Western Digital DX4000 (Windows Storage Server 2008 Essential) and the backup worked on both devices.  Backup to ReadyNas devices did not work as the connection to the VHD was lost during backup.  Your mileage may vary.

This worked for me in Windows Server 2012 Standard, Windows Server Backup. Created VHDx on Synology NAS share, initialized/formatted/assign drive letter. Created backup task with local drive letter and success! Thank you!

Hello Everyone,

Thanks for contributing to this stream. I have just hit this problem trying to make an image backup upon Windows 8 Pro to a Western Digital MyCloud 2TB NAS device. I was clueless as to what was causing it and as usual Windows was no help whatsoever in guiding me to a solution.  It does seem the NAS is a problem for MS because when I then performed the same image backup to a USB disk it completed cleanly.  As I am sure most of you know when you are looking at a indecipherable error code like this one you then have whole host of options to look at. Thankfully you saved me from that and wasting a great deal of time. 

Thanks a lot for taking the time to report it. 

Regards

Patrick

Hi !

Backup to NAS from Windows 8 works ( at least to Synology DS1813+ ) IF and AFTER:

 - disable SMB2 and large packets in Synology

 - edit smb.conf and ADD “strict allocate = yes” to all Shares !!!

 

After that also Windows 2012 can backup to NAS !!

 

Hope it helps,

Christian Aichmair

Thanks for that info, but i will not downgrade my NAS, SMB2 gives my network a unbelievable performance boost. I decided to turn Windows backup features off and wrote tons of comandline scripts for backups with FreeFileSync. This is not user friendly and not noob free. What a shame Microsoft.

Avec la sauvegarde du disque entier  "C" j' ai échoué et j' ai une erreur signalée !! mais une autre sauvegarde avec cette fois la sauvegarde sur "C" des fichiers "Downloads","OEM", "Users",  3 "program files et Data", cela a marché !! Cette Sauvegarde pèse 11,63 Go ...Par contre Je ne sais pas si cela sera suffisant pour réparer en cas de problèmes...?

Salut DANY