When I first read VHG's reply I disagreed ....
I read it again ... and now I agree with the spirit of it (I'm not going to read it again!!)
The term "backup" implies making a copy - NOT just moving the files elsewhere.
The medium used is immaterial ... HDD/FDD/CD/DVD/DAT/tape etc -
I know firms who use all the methods ... what counts is having access to them if part of the system fails.
statistically HDDs fail less than any other storage medium ... they didn't catch on in the past because they were just so expensive .... (and interfaces were so slow)
CD/DVD - we've all made "coasters"
It's said that the resin used to make CD/DVDs oxidises
and makers are now marketing "long life" opticals which cost up to �5.00 each - and have a 100 year lifespan. for proffessional (legal and such) archives
Now to agree with ethel ....
I'd also go for the external hard disc
they are cheap (0.24p per Gb) - and fast
Computer shopper rated the "Buffalo drive station combo 500Gb" as best buy for �112.00 (you did say two laptops)
if that's too much ... go down to PC world
back to VHG
the trick (as vhg says) is to create the backup in the first place - and then to keep it up-to-date
So create a full backup to CD/DVD as well
(don't archive or compress them first!!)
and
(get decent discs - not the cheapest - and make sure you test them before you put them away!!!).
To make sure you don't waste any space try
Burn to the Brim
http://bttb.sourceforge.net/history.html
Makes the most efficient use of your discs