I burn 25 GB M-DISCs every few months.

If I were being properly rigorous I'd be burning three copies and putting two of them in different physical places.

Printing out the occasional photo book of our favorites is also a part of the strategy - if our grandkids want to see photos of our lives after we're dead, they won't need to worry about lapsed hosting bills or ancient storage technology. They can just look at the book.

Obligatory reference to my rant about data preservation:

http://howicode.nateeag.com/data-preservation.html