well, if youre gonna back up most of the time, i would go for the 8x8x32. keep in mind that you can always lower the speed to 4x until youc an get some 8x cd-rws. if you get a 4x rw burner, youll be stuck at 4x. what brand is this 8x8x32? then i can give you my opinions. as for the scsi, you wont have to upgrade it. my friend has a lacie 8x4xsomething running off the built-in scsi in her beige g3/dt. and i have a 6x4x24 running on my quadra...
however, it might be easier to get a dvd-ram drive for your purposes. with a cd-rw, you have to go through the effort of burning a cd every time you need to back up. with a dvd-ram, you can just drag and drop, like a big ol hard drive. the cartridges are something like $40, but they are rewritable, and they hold about 5 gigs each.
check the following webpage: Using DVD-RAM
http://til.info.apple.com/techinfo.nsf/artnum/n60235
and by the way, the built-in zip isnt scsi, its ide. so you have 1 device on your scsi chain, the scanner.
dabradda
[This message has been edited by dabradda (edited 05-26-2000).]