Changed Hard Disk for Time Machine

I have a question, I've searched and can't find the answer (maybe I'm just not good at searching).
I ran out of room on my external HD for time machine backups, so I added another external HD and changed the time machine location to the new HD. I did not copy any backup files to the new HD, I figured that I'd just keep the old ones on the old HD and start from scratch.
I am using an old iMac G5 that has one (yes, one) USB2.0 port, the other USB ports are the old, slow ones. I have the new HD plugged into the USB2.0 port and the old HD plugged into one of the other ones.
Then I selected "back up now," and it's been backing up for more than 12 hours and it's only about 1/3 of the way done according to the progress report (37.4 GB of 96.9 GB).
Question -- does time machine automatically copy my old back up from the old HD to the new HD? That's the only thing that I can think of that would make this back up so slow. It shouldn't take 12 hours to back up 37 GB, right?

Thanks. I think I need to just wait until it's done and then check things out. I let it run all day while I was at work, and it's another 1/3 of the way to the end. I don't want to stop it and then find out that I just need to let it run its course.
Here is the backup log from the time machine widget:
Backing up to: /Volumes/Backup/Backups.backupdb
2010-06-22 18:33:57.446 FindSystemFiles[1245:713] Querying receipt database for system packages
2010-06-22 18:34:02.962 FindSystemFiles[1245:713] Using system path cache.
2010-06-22 18:34:03.335 FindSystemFiles[1250:713] Querying receipt database for system packages
2010-06-22 18:34:04.293 FindSystemFiles[1250:713] Using system path cache.
Event store UUIDs don't match for volume: Storage Central
Event store UUIDs don't match for volume: Alternate Storage
No pre-backup thinning needed: 116.45 GB requested (including padding), 376.49 GB available
Copied 11 files (0 bytes) from volume Storage Central.
Event store UUIDs don't match for volume: Storage Central

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