Time Machine sees 410GB on only 160GB HD

I got a new 750GB external hard drive to back up to with Time Machine, and during its initial backup, it says "Backing up: __ GB of 410.5 GB". But the internal HD on this MacBook Pro 17" is only 160GB (149.05 GB according to System Profiler). So, what is making Time Machine see 400 GB ? Is something wrong? Will this screw up Time Machine?

John01021988 said:

What are you backing up? generally time machine will back up your Mac HD and other partitions. If you want to skip a partition, just get into preferences and make sure it is set to backup only your mac HD.

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My MacBook Pro has a 160GB internal drive. There is only one partition on it. There are no other external drives attached besides the Time Machine backup drive. Here is the Time Machine Preferences Options:
Do not back up:
750GB_MAXTOR (43.0 GB)
Applications (Mac OS 9) (169.0 MB)
/temp (1.9 GB)
/tmp (68 KB)
/VIRTUAL_MACHINES (27.3 GB)
Total Included: 407.7 GB

So this is kind of weird. Where does it come up with "Total Included: 407.7 GB". Any why does it say "750GB_MAXTOR (43.0 GB)".

The following are consistent: 55.6 GB have been backed up to it so far. The Time Machine preferences says about the Maxtor: Available: 636.9 GB of 698.5 GB, which is what Finder shows as available.

deathshrub said:

Why do you have Mac OS 9 applications on your Intel Macbook?

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My patrimony.