I am assuming you want to do it in Linux. Try tar
and split command. I haven't tried split
command but you can try it on some other data.
split -m4096 <file-name>
This will split the file into chunks of 4096 MB or 4GB...right about a size for one DVD. Then you can just burn data DVD's.
Read up on it before you do.
BTW, i have a usb HDD just for that purpose. I just rsync every so often.