Time Machine not thinning older backups (Hourly= Daily= Weekly)

Ever since upgrading to Snow Leopard, Time machine has kept hourly backups of my computer.
In the past under 10.5, after about 24 hours, TM would delete all but the last hourly backup of the day and keep daily backups for 30 days, then after about 30 days delete the daily backups except for 1 per week and keep weekly backups thereafter.
Now, TM does it's hourly backups like normal, but I have hourly backups from today all they way back to 29 August (about 24 hours prior to when I upgraded to 10.6) and then weekly backups from that date until 30 July (i.e. about 30 days prior to the upgrade).
Called AppleCare and talked to 2 different people. Both questioned whether TM really was even supposed to thin old backups like this (um, it's written in the da^^ preference pane, guys) and one admitted that he doesn't even use a Mac at home and that in the support office they don't have TM on their macs, so he's never used it!
Needless to say, not sure how to a) get TM to start thinning the backups like it should and b) also thin out all the previous backups so I don't have a 2 month glut of frequent backups.
I've looked all over and found nothing. Anyone with some advice? I'd like to avoid killing all my backups and starting over.

Forensic
I suggest you follow the advice posted above by V.K., once installed it will provide a log of what TM is doing.
Once you have that info, post back here and someone far wiser than I will help you to resolve the issue.

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  • HT3275 Time Machine not deleting oldest backups when the disk is full

    Time Machine not deleting oldest backups when the disk is full

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    Message was edited by: Pondini

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