I'm actually using CDRWs :-[    Well amongst others! :P

Im interested to hear how other people backup stuff cause Ive learnt to use computers myself & at times can be plain ignorant of, oh well, lots !! - I'll tell you my situation:

I work on maybe 100 drawings at a time, ends up being a lot more files cause as I correct them I save as a new file.
These I back up on a couple of disks of which I try to keep at least one fairly current copy "off the premises" (you never know ..)

I use nero (express I think its called - Im not at home now so cant check) Its the simple interface anyways (came with the burner)
I either simply click on make "datei Disk" (literally "file" - its in german) & it updates\synchronises data on disk with equivalent on harddisk. 
Or I save contents (nero) file after burning & open that for next backup.
I dont know how trustworthy these are, esp. the second option.
Every now & again I copy disk to regular CD for "snapshot".

Are there other options?
Software, hardware ??
as I usually work on the one computer Ive never gotten a USB stick - are they fairly dependable ? - could be an option for "current work". (in the past Ive used a zip drive, I guess stick is just much more convenient version of  same).
I usually have finished jobs or "jobs on a break" on DVD or CD anyways.

The CDRWs I use are Octron (ancient by now) & intensto & I dont have many - (keep reusing them (!)) mostly without problems - if there is a problem i just use a different disk for that backup  & format the problem one (~ 45seconds b.t.w.)

thanks for any advice tips links etc, tom