[dnanian]

Hi, Lizzy. I'm not entirely sure what you're trying to do here, regarding "original factory settings". Certainly, you could copy onto the MyBook, but from what's been said on this forum and elsewhere, the MyBook cannot be used as a startup drive for Power PC based Macs.

You wouldn't be able to "reset" your internal drive and then continue backing up to the same partition on the backup without (at the very least) overwriting your existing backup, unless you created a second partition for this use.

What it sounds like you need to do is to buy a larger replacement disk for your Powerbook!