No matter what technique you use, it's a good idea to make sure to set up reminders to create those backups. Mark it on a calendar. It's easy to forget to make the backups for months at a time.
Something people tend to forget is that both media (floppy, tape, optical disk, cd, DVD) and storage formats (arg,jar, jpg, gif,zip, bz2) can and do become obsolete. Even RAW formats may not be readable in 20 years, if the format of that particular file is no longer supported by the software makers of the day.
Particularly insidious is the tendancy of backup programs to create backups that only they can read. If the company goes out of business and you change your OS you may find yourself with backup disks that you can not read.
I mention this only as a reminder that when you get a new storage device you should copy everything to the new format, even the old stuff that you hold onto but haven't looked at in years. You should also re-copy all digital media at about 1/2 of the expected lifetime of the media.
Next to my desk is the following old media from the last 20 years;
QIC-80 tape (3 types),
DAT tape (2 types)
5.25 inch floppy
3.5 inch floppy (4 types)
CD-R
CD-RW
DVD-R
DVD+R
DVD+RW
Several pulled drives from assorted upgraded PCs, Laptops and Tivos.
Hmmm. I guess I can get rid of the 5.25 inch floppies, since I don't have a drive that will read them any-more. They once had correspondance from the early 80's. Likewise, the disks from my days as an Atari user are probably unusable, since the programs that read the files no longer exist.
Hope your effort goes well.
Daniel