Old computer files

What do you do about old computer files?
 My husband said - in the 1990s - why do you print everything out? It's on your computer so save it on your computer. 
Well, now I've lost a lot of stuff that I 'saved' on the computer because digitalization keeps changing format. Recipes are gone. (unreadable files) Manuscripts that I didn't print out are gone. 
I'm now going through my (new) computer and testing each file and deleting things that I no longer can open. I did print out everything from college, so now I'm trying to find that stuff on the computer and delete it. (also so much college email I need to delete, because I did print out the important stuff. 
When I moved from the east coast to the west coast, I looked at all the 5 inch and 3 inch floppy computer disks that I had saved, shook my head, and tossed them.

Father's Day memory

Memories of my children's father on this Father's Day

We often drove to Florida to visit my mother. On one trip, my husband was in computer withdrawal. (laptops hadn't been invented, yet.) He did, however, bring pads of paper and pens and pencils.
Partway through our visit, he took these supplies out and sat there staring at them. He looked up at me and with a straight face, asked how he could enter information. Trying not to giggle, I pointed out both ends of the pencil. "You ENTER with the point. And you DELETE with the eraser. 　  
(He had a dry sense of humor which we bounced off each other.)