Time Machine Backup fails every time "Backup could not be completed"

I want to do a new Time Machine Backup on my iMac2007 Snow Leopard 10.6.8 fails every time with message "Backup could not be completed."
Console says "Error 11" Some Files allways can not be copied/saved by Time Machine, i search an exclude them in TM not to save them, try again, new ones po up every time.
Does anyone know a solution?

One thing which may help.
I had similar issues....a few times.
Have done all the renaming (<8 characters) etc etc as detailed in these forums.
The first time, I erased TC HD and started again. This fixed things for a few days, and then the same issue came back again.
The next time, I simply copied the sparsebundle file (so I had two sparsebundles, one called xxxxxxxx.sparsebundle, and the other called xxxxxxxx copy.sparsebundle (luckily I had room on the HD to do this)). Then I deleted the original sparsebundle, and before I could rename the copy back to the original filename, the image mounted and started backing up....to the sparsebundle with " copy" still in its name.......so I left it be.
A week or so went by, and then I got the same "unable to mount" error message.
Rather than going thru the whole process again, I simply took the " copy" out of the sparesbundle filename, and all was well again.
I continue to get "unable to mount" error messages occasionally, so I simply rename the sparsebundle file (either by adding or removing " copy"), and it seems to resolve the problem, at least for a while.
While not a fix, it seems to be a workaround for me until Apple works out what the issue is, and fixes it.
Hope this helps someone.
P.S. One word of caution. I just had the thought, while writing this, that I have not actually gone into Time Machine to check that previous backups (eg, one hour ago, one week ago, original backup) are there and are able to be accessed, should the need arise. Because the back-ups appeared to be working, I assumed, and assume, they were. Won't be able to check this for a few days as I am on the road.

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Plug your iPod Touch to your Mac/PC using USB cable.
Open iTunes software and choose “backup to this computer” .
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http://pondini.org/TM/FAQ.html
Q16 17
Use ethernet only. Turn off wireless so it does not enter the situation.

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Time Machine Backup fails every time "Backup could not be completed"

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