I have had this problem for about 2 or 3 days now.
I get the following error (see screenshot):
http://i133.photobucket.com/albums/q46/ ... 109021.png
I have tried deleting the com.apple.timemachine.plist and that didn't work.
I've removed the share from my synology NAS and my iMac did back up once I re-enabled it but the problem came back today.
Can anyone advise what the problem may be, I am running 10.7.3