Always have backup of important stuff.
And to add to Remis cute little text.
IF you are going with several small drives, backups regulary what is important, you can always put them in a RAID0 stripe for improved performance!
Or maybe even RAID1 for automatic "backup". But RAID1 is probably only interessting if you actually have the money for it, since it mirrors the first harddrive, and nothing more. So buying 2 1TB HDDs will result in only having 1TB with RAID1...
But now I am probably going a bit deeper than most people on this forum is even interested in going