Your Precious Backups

One of my HDs died yesterday although it didn't have that much that cant be recovered elsewhere.
The problem that I have is that I usually keep a clone backup of my main machines HD. But when I increase the size of my main machines HD, I need to get another HD of matching size or I cant make a clone.
In general I have tons of HDs which are backups of backups etc.
Lately I've been thinking of going the Blu Ray route where each disc holds 50GB (its 50 right?).
The going price here is 8,000 yen for 20 blank Blu Ray discs.
How do you keep backups of everything? Do you just burn everything to DVDs or get extra HDs? Anybody here keeping backups on Blu Ray?
Is there a magical place on the Internets where you can download whole series in the event that you loose yours?










