I'm one of those guys who should know better, but can still manage to mess stuff up anyway, despite my best efforts (i.e. my best isn't good enough). I generally believe in the adage that if you don't have your important files backed up in three places, you don't have your important files. Most of my files are saved on a couple of computers and I have a couple of larger (8TB) portable drives that I use to keep a tertiary backup at my family's farm, which is a good 12 hour drive away. Whenever I visit I bring one drive and swap it out with the one that is already there.
Thing is I cannot afford to back up ALL of my files because I have my entire video collection on a home server....I will be fixing that soon, but not soon enough to save all of my 3d printing files. I had a lot of .stl's on a portable drive and I-kid-you-not as I went to pick it up to make a copy of everything on my home server I knocked it off of the table. Now the drive doesn't work.....
"Luckily" a good chunk of my files are available to download again from DriveThruRPG and MyMiniFactory, but most of the stuff I had picked up on Patreon over the years...... *POOF*. Anything that was actually conveniently organized........*POOF*.
I'm probably 30 hours into downloading what I can......and once it's organized I'm thinking that I need to burn these to some M-Discs.
Now all of my "regular" RPG files are at least thrice back-up, but please....take my pain-in-the-ass (it's actually a little sore as I'm taking a break from downloading and organizing a bazillion files.....to type this) as a mental note for you to back your files up. Have at least three copies and one off-site.