had the same issue with backup over the lan..ending with
0x8007007b error
Some time ago I upgraded my system with a SSD and I moved the entire C win 7 partition to SSD. In the end the system had: 1 ssd and one hdd...an I kept also the old win7 as a hidden partition on hdd. After a system crash..I restored the bootloader with a cd...dindn't remember how, and perhaps it installed a vrong bootloader..bcd etc. During boot I had 2 entries with win7..one linked to ssd which booted normally..and a broken one..linked to old ..hidden win 7 partition on old hdd.
the fix was to boot from a win 7 repair cd/dvd
command promt ..
bootrec /fixmbr
bootrec / fixboot
bootrec /rebuildbcd
which ended with an error "
Total identified Windows installations: 0"
the solution found
here
"4. Since the BCD store exists and lists a Windows installation, you'll first have to "remove" it manually and then try to rebuild it again.
At the prompt, execute the bcdedit command as shown and then press
Enter:
bcdedit /export c:\bcdbackup
The bcdedit command is used here to export the BCD store as a file:
bcdbackup. There's no need to specify a file extension.
The command should return the following on screen:
The operation completed successfully.
Meaning the BCD export worked as expected.
5. At this point, you need to adjust several file attributes for the BCD store so you can manipulate it.
At the prompt, execute the attrib command exactly like this:
attrib c:\boot\bcd -h -r -s
What you just did with the attrib command was remove the hidden, read-only, and system attributes from the file
bcd. Those attributes restricted the actions you could take on the file. Now that they're gone, you can manipulate the file more freely - specifically, rename it.
6. To rename the BCD store, execute the ren command as shown:
ren c:\boot\bcd bcd.old
Now that the BCD store is renamed, you should now be able to successfully rebuild it, as you tried to do in Step 2.
Note: You could delete the BCD file entirely since you're about to create a new one. However, renaming the existing BCD accomplishes the same thing since it's now unavailable to Windows, plus provides you yet another layer of backup, in addition to the export you did in Step 5, if you decide to undo your actions.
7. Try rebuilding the BCD again by executing the following, followed by
Enter:
bootrec /rebuildbcd
which should produce this in the Command Prompt window:
Scanning all disks for Windows installations.
Please wait, since this may take a while...
Successfully scanned Windows installations.
Total identified Windows installations: 1
[1] D:\Windows
Add installation to boot list? Yes<Y>/No<N>/All<A>:"
and added only the SSD windows installation..to show in boot os selection menu
after that the backup to NAS works just fine!