If you only back up to a hard drive, it WILL fail. One day when you really don’t have time to deal with it. If you aren’t already working with my friend Alex Liebeskind, you should look into this.
It’s especially nice if you use multiple computers, and ANY kind of smartphone. The Basic package is free.
I backup 30 GB constantly and they are synced between two computers as well. I pay $4.99 a month for peace of mind.
Best of all you can give someone a URL to a big file which they can download.
It’s good stuff.