Does Choose Backup Disk to change backup drives copy the old backup?

I am about to install 10.5. I plan to use TM with my FW800 LaCie 500GB drive until I get a RAID. I see that one can change backup disks with System Preferences > Time Machine > Choose Backup Disk. When you do this does the entire backup get copied from the old disk to the new one? If so, great. I can format the LaCie drive and redeploy it.

When you attach and choose a new drive for backing up, TM will begin a new full backup. It does not copy from one backup drive to another. But once that backup is done, you'll have two drives that can be used by TM (not at the same time). If you don't want one of them, you can erase it. However, as you probably suspect, the new backup will not have the history of old backups that the old drive has.
If you search around the forum, you might find one or more old posts that talk about performing a copy from one backup drive to another, using CCC or SuperDuper, I think. So what I think you want to do is probably do-able. Just look for those posts, you'll get the details.

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