I haven't seen this question asked before although we've talked a bit about when it's come up related to other issues. It's more a curiosity but we might learn about other techniques with this exercise, too.
1. What do you backup (i.e. what's important to you)?
2. What program or programs do you use to backup or do you use a script?
3. Is automatic or do you have to manually do it?
4. How often do you do it?
5. Do you have more than one backup?
6. What do you back up to? Another partition? An external drive? Online?
7. Do you password-protect your backups?
8. Do you test your backups? If not doing a test restore, do you look at the backups to see if they look legit?
9. Have you ever had to do a restore from backups? And did it work?
There's a lot of questions so I numbered them to make it easier to answer by referring to the number. You could, of course, just answer them in a paragraph or two if you prefer. And skip questions if you feel they might compromise your security or privacy.
I don't have time to post my response yet so I'll do it later.