You shouldn't backup anything to compact disc media. However if you're dumb enough to back up to a unreliable media (as I once did), you mind find the following old tips helpful:
I never ever remember this. So here I am recording the information about burning CDs with :
mkisofs -o /tmp/backup.iso . cdrecord -scanbus cdrecord -v speed=12 dev=0,0,0 -data /tmp/backup.iso
I back up my mail every so often. I generally keep my mail. My last backup of mail was 50 megs, compressed! GULP.
tar cvf backup.tar Mail/ bzip2 backup.tar
Encrypting my mail:
gpg -e -r hendry backup.tar.bz2
To decrypt, word of advice, do not use gpg -d, just use: