Hey, i need help because i want to format my computer, and i want to know if i need to save every file on drive to not lose it, thanks 
Depends what you mean with everything. You can just copy the Aseprite folder to a USB drive or something and then copy it back into the computer easily, but any art you’ve made is not stored in aseprite, it’s stored on your computer, so if you want to save that you have to do that before you format.