Directly after buying this baby I had no problems using the built-in Time Machine compatibility. Then the problems began. Back then I wasn’t able to associate an application directly with the failing of the backup. I worked around the problem using the hacks to use any NAS as a Time Machine backup volume.
However, a few days ago I bought a new iMac and after copying over my data and installing all the applications I use I wanted to setup the Time Machine backup. Unfortunately I had no further luck than the last time, the same errors (error 17 and error -6508 while creating the Sparsebundle) occurred. For testing purposes I set up my "old" iMac anew and… the backup works perfectly. My old machine was just setup with OS X 10.6, all the updates available and iLife '11. There the backup works, on my new machine with a newly created user profile it fails.
I’m running such applications as MacFUSE and Total Finder which are known to integrate very deeply into the operating system. I disabled those, still no luck. Then I started killing background processes, but still… no luck.
I’d love to hear your ideas as I don’t know any further. Thanks.