I also had TM slowdowns (preparing taking up to an hour). I deleted the Spotlight index on the TC volume and I ran DiskWarrior on the mounted TM image. Both steps helped (preparing now is just a few minutes).

However, DiskWarrior took hours, posting messages that things would take longer due to hardware issue. My computer froze several times while DiskWarrior was running. I think in the end I ran DiskWarrior from its CD.

So far, nobody could answer me the question how to check the TC disk for hardware problems.

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