The error in the title is common, there seem to be no definite answer as far as I and many have found so far. Before posting I searched MDL Forums but could find no relevant W7 thread/post. So, the issue occurs, in my case, when backing up a W7 pc to a share on either a NAS (directly) or to a share on a server. The network used is either WiFi -n or GB Lan. Does not matter much, except time wise. Regardless, the backup fails, giving Error 0x8078002A in the Win Backup Manager and Error : Code: [ Name] Microsoft-Windows-Backup [ Guid] {1DB28F2E-8F80-4027-8C5A-A11F7F10F62D} EventID 517 Version 0 Level 2 Task 0 Opcode 0 Keywords 0x8000000000000000 - TimeCreated [ SystemTime] 2010-07-18T09:56:38.487305500Z EventRecordID 27691 Correlation - Execution [ ProcessID] 3812 [ ThreadID] 844 Channel Application Computer WHATEVERCOMP - Security [ UserID] S-1-5-18 - EventData BackupTime 2010-07-18T08:44:52.838127800Z ErrorCode 2155348010 ErrorMessage %%2155348010 in the Event Viewer. All network paths and all shares are 100% accessible as intended under any other circumstances. Some solution attempts have been posted, like trying to do the backup immediately after boot up, that it may be cluster size related (different cluster size on target share and the PC that is being backed up) and maybe something else I have not seen yet. So, are you any good at Windows besides circumventing its licensing?
Server or PC it's still the same software. If you have any power saving options then try the backup after disabling them. Failing that I think you'll have to call M$ support.
could it be a access right issue? i went through this something very similar. finally got mine to function 100% correctly. what i did was add a password to my admin account on my desktop pc then when i selected the network location for credentials from my laptop i used \Example-pc\example then that pc's password. after that my backups work perfect ran one each day to make sure works. that over a wireless too to a 1.5 tb external of my desktop. i also set folders to share for everyone as well as changed security to everyone for the backup drive i use.
I have power saving options on laptop, bus those have ben disabled, and for whatever its worth no Power options on the desktops. Why would I want to call M$ support when I can ask here? Sure, my Win7Pro is legit, but the Server 2008 is, I fear, not so much. Kaos420, I have paswords on all accounts, even admin. I have also even created a specific Backup Operator Account (created both on server and on workstations) with sole access to the Backup share. Nothing works.