Time Machine wrongly determines the backup size

I have weeks with this issue:
I have a 233Gb capacity hard drive out of which I have only 132Gb being used or what is the same, 101Gb of free space on disk.
When attempting to run Time Machine, either by doing the manual Back Up Now or the scheduled and automatic backups, I get an error which I used not to have before. Time Machine can not complete the backup and I get an error saying something like that "the size of my backup is 530Gb while the backup disk has a capacity of only 300Gb".
Why does TM determines such a big backup size, close to 4 times of what I actually have worth of data ? I have FileVault activated, is this part of the problem ?
Like I said before, it used to work fine some 5 weeks ago, now it simply does not. I have already erased/format my backup HD and still is not working and I have just installed the new Mac OS X 10.5.5 update and still the problem continues.
Thanks in advance for your help.

it could be filevault. try disabling it and see if the problem persists. also, make sure no other drives are connected to your computer. if there are, TM will attempt to back them up unless you add them to TM exclusion lists in TM system preferences->options. if none of this helps it's a bug. 10.5.5 was supposed to fix it according to the support documents but it would not be a surprise if it didn't.

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