I recently acquired an iMac G3 (slot-loading, 600mhz) with a 40gb hard drive in it. I'm wondering if it would be possible to make the computer automatically back up certain folders on my main computer over the internet. Basically it would just be a backup unit.

And also, would it be possible for me to put a second IDE 40gb hard drive in the imac? Possibly replace the disc drive with a hard drive? How hard would this be?
MacBook Pro Intel Core Duo 2.0ghz, 1gb ram
Dell 228WPF 22" monitor
Mybook Premium 320gb
iPod Nano 4gb (red)
Wacom Intuos3 6x11