I have 2 intel Macbooks running 10.6.4. I also have a 1TB external HD for Time Machine back-ups.
One of the machines backs-up fine every time and one wont. Each time I try to make a back-up I get a message saying that there was an error in transferring some of the data.
I have resorted to using Apples 'Back-up' software for this machine and this works fine, but Time machine would be better.