Do you save your blog posts? I know not all of them are worth saving - but some surely are - especially those in which you write about childhood memories or life events.
I have been printing some of mine from the beginning, with comments. I put them in 3-ring binders, to save for posterity. I imagine that someday my children will quit making fun of blogs and decide to read them, or that my grandchildren will one day want to learn "what made grandma tick" and give them a try. They can be saved to CD's, of course, but there is nothing like the printed word to hold in your hands and peruse at leisure, is there?
Now don't tell me that you write about nothing worth preserving, because I won't believe it. Buy your binders today, and happy printing!