I'm trying to make a full system image through file history, and I get part way through the process until I get the following error:

The backup failed.

There was a failure in preparing the backup image of one of the volumes in the backup set. (0x807800C5)

Additional information:

The process cannot access the file because another process has locked a portion of the file. (0x80070021)

I've found one other thread where this was an issue and the user said that he had no issues doing it to a USB drive, so I'm assuming it's related to using a network one. I can run file history/recovery (whatever it's called) to the same network attached server in the same parent folder so I know it's not a permission issue. Any help would be greatly appreciated.

Hi,

In order to know whethr this issue is related with the speicfic NAS, I suggest you try to backup the image to another external drive and check if the error persists.

Actually, according to the error message, it seems more related with the files which need to be backed up, it is locked\unaccessable. I recommend you temporarily turn off any anti-virus program protection. Stop other running processes including background processes, then try to backup again, test the result.

Regards