Time Machine doesn't do a full backup

Hi there,
I have a 320GB external hard drive I use as a Time Machine backup. This has always worked before.
Recently I reformatted it and made a small partition (70GB) for other bits and bobs. Now though, whenever it backs up only a few KB of data seem to change, nothing I add or delete on my MacBook HD gets backed up to the external drive. Which is worying!
There's ample room in the backup partition to add the updated files, but it doesn't.
I've troubleshooted it, done a full reset etc, but I can't work it out. Any help would be greatly appreciated. Is it best not to have any partition at all?
Thanks in advance.
- Stevie

I did some more reading and I found that Time Machine would find the older backups once a new backup is completed.  The backup ended up being a little larger than previous backups (2.65 GB vs typical incremental backups of several MB's)  but when it completed, time machine updated the last backup time/date and the oldest backup time/date properly.  So I guess, I don't have a problem.

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