We have had a home computer since 1994 so you can imagine the changes we have been through. I still have my external zip drives somewhere..lol.
Are you saying DVD's last longer than CD's or are you just continually upgrading to keep your data on the newest thing out there?
LOL, yeah, I think it was floppy to zip, to cd, to dvd and soon too be, I'm sure, memory sticks in some form.
I try to stay current with the latest technologies. I use less DVDs than cds so I have less to sort through, but on the other side I still keep my cd's just-in-case something happens to a DVD, or I'll make duplicate DVD's. I'm not sure DVDs are better than CDs, just that they store more so I use less of them. They are still trying to iron out whether they will use the +R or -R DVD format. I use +R for data and -R for video.