SOLVED: Error -50 during backup if trying to update to iOS 5

Hi there!
Issue:
As I would update my iPhone and iPad 2, I got the following error, while iTunes was trying to save the backup:
"Beim Backup der Daten dieses iPhones / iPads ist ein Fehler aufgetreten (-50). Möchten Sie mit der Aktualisierung des iPhones / iPads fortfahren?"
=> no, you shouldn't ;-)
Issue solved:
Since I couldn't find a solution for my problem while searching the Internet, I'd like to share the solution, which I could find myself. :-)
Reason for the issue:
The point is, that I redirect the iTunes backup to an iSCSI drive on my NAS. This works usualy without any problem, exept during updating to iOS 5.
Solution:
I temporarily replaced the link 'backup' in the MobileSync which redirects the backup to iSCSI network drive with a folder named 'backup' for iOS 5 installation:
/Users/<USER>/Library/Application Support/MobileSync/backup
So the backup will be created local to the Mac instead to the iSCSI drive.
After installing iOS 5 I could replace the folder again with the link and all works perfect.
Bug report to Apple:
This behavor should be corrected. It seams to be a bug in iOS 5 upgrade process in iTunes in my opinion.
Howsoever, it's easy to solve the issue, if you know the reason.
Maybe I can help someone with this hint.
Sincerely

THANK YOU. Saved me a few hours, this did.
This is stil not fixed in the latest iTunes, MobileSync, or iOS 6. Whichever piece has the problem is still badly broken, and in this age of 64 GB flash drives in MacBook Air models, surely we're not the only two that have moved that monstrous folder out to an external drive....

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SOLVED: Error -50 during backup if trying to update to iOS 5

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