[pmoriarty]

Good for you. If you can afford it, go for it. But I'd still use something like par2 over each of your backups.

[Symbiote]

I use PAR2, even with multiple copies at different sites, because I look at my photos so rarely that I wouldn't notice a master file had become corrupt before it had mirrored to the other places and the original versions expired (1 year).

5% parity archives is an easy sell, on top of 200% for off site copies.