Problems with Windows Backup (system image)
When I try to do a backup to a network share, the file level backup works ok, but the System Image Backup writes about 37 GB of data, then fails with error code 2155348315 (0x8078015b - error when accessing the remote shared folder). The system itself is using about 50 GB of disk on C: and 18 GB on E:. The network share is on a Mac OS 10.6 system (i.e. Samba).
September 13th, 2010 2:36pm

Hi, Please try the following steps on the Windows 7 computer to change the NTLM authentication level: 1. Click Start. Enter “gpedit.msc” in the Start Search box. 2. Locate to Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\ 3. In the right pane, double-click on “Network security: LAN Manager authentication level”. 4. Change the level to “Send LM & NTLM - use NTLMv2 session security if negotiated”. Also, please check if the share folder can be accessed with UNC “\\computername\folder or \\IPAddress\folder”. Ensure the permission is OK and the share folder has enough free space to put a huge file more than 37GB. Regards, Sabrina Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
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September 15th, 2010 12:01pm

Thank you for your reply. I changed the network security level to Send LM & NTLM - use NTLMv2 session security if negotiated. I checked that the folder can be accessed with UNC (it can) and I checked that the share folder permissions are set correctly. But anyway, the backup can write files onto the target drive -- it fails during the writing of the system image backup (it creates the file OK, but some number of minutes -- 15 to 30 -- after creating the file and writing to it, it fails). I also verified that the share folder has about 700 GB of free space. The System image file is about 38 GB, so that shouldn't be a problem. But I am still failing with 2155348315 (0x8078015b. If it is helpful -- I am connecting via WiFi (802.11n) to a router, the router is connecting over powerline (HomePlug AV) to the backup device.
September 17th, 2010 1:16pm

Yes, you can have a try. Also, please try to backup to another computer and use the wired to see the result. This issue can also related with the settings of your MAC. Please check the policy. Regards, Sabrina Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
Free Windows Admin Tool Kit Click here and download it now
September 22nd, 2010 1:02pm

so, i know this is an old post and i aslo commented on another post as well, but for anyone that is searching for a solution for the "0x8078015b" backup error, i have the solution. I had the same error when trying to backup and this is what i did to fix it. It seems that the target that you should save the backup, MUST have at least twice the free space of the size of your backup. So when i tried to backup my 74GB system disk on a 120GB (free space) HDD i kept getting the 0x8078015b error, but when i changed the save target on a 500GB HDD (the amount of free space i had on a 1TB HDD), the backup process completed without errors. And after some search on the onternet i also found some other forum posts that were stating the same. YOU MUST HAVE TWICE THE FREE SPACE ON THE TARGET YOU ARE SAVING YOUR BACKUP.
February 7th, 2012 1:08pm

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