No, it's not some new hi-tech material for tent poles.
It's an on-line backup service that costs £25 a year. Set it up and forget about about it until you need it. Depending on how much data you want to back up and your connection speed, it takes about 5 or 6 days to do the initial backup.
After that, it sits in the background, archiving your precious photos, mp3's, memory map routes or whatever else is dear to you. There is no limit on the amount of stuff you can back up.
Have a look at their website and consider it a cheap insurance premium for the years of 1's and 0's you have gathered. It's beautifully simple :)