I keep most of my work saved to different folders on my laptop, but some of it is also kept on my old flash drive just in case. I haven't drawn anything on paper in years, but all of my traditional doodles are stuffed inside of my notebooks and old school folders.
If not sprawled out on the ground, I keep my art stuffed in the front pages of old notebooks because why not. In the rare case of me going onto an app on my tablet and doodling there, I just locally save it to the tablet.
On my computer in the Pictures section, within a specific folder. I pray nothing happens to this laptop since otherwise all the images would be gone.. but it's too tedious to back them up haha. Hopefully I never have to regret that decision. =s Once I feel the computer is on its deathbed I'll scramble to back everything up, but for now I'm ok this way!
My traditional is saved in a folder, or in my sketchbook, and my digital stuff is saved on the app I drew it on. I should really find somewhere to save it in case the app malfunctions(It's happened before).....
Usually,I Keep My Art On Dropbox Or Onedrive. When The Artwork Is Ready To View,I Usually Upload It In Deviantart.But I Made A Copy Of The Artwork On Computer,Dropbox Or Onedrive Just In Case The Artwork Need To Be Remove(For Some Reason But Surely Not Because Of Rule)
I keep a nice little folder called "ART" all in caps. And the names I give my art is interesting but that's another story. I have subfolders of the art folder, a folder called "shitposts" and "wips." My shitpost folder is exactly what you think it is.
I have a file on my drop box which is then split up further. My folders are: Sketches OCs Fanart Commissions/Trades/Gifts Super Old
I have a documents folder with files upon files of artwork, from Pokémon to original art to fan art to references. So yeah.
I put all of my art in one folder. Both the source and the .png files can be found there. I would organize it but I'm far too lazy to do that.
I save everything in a little folder on my desktop! I have a habit of deleting things after a couple of weeks or so because I get tired of looking at them so I don't really have to worry about storage space eheh... >v>;; I haven't been drawing too much either as of late, I should probably fix that!