Thanks. Are .PDN files automatically saved as lossless in paint.net? I never see an option to save as lossless, I just select Save As and then chose .PDN from the dropdown file type list and it saves it as a .PDN file. Then when I open the .PDN file, it contains all the PNG layers, but I wasn't sure if that was because I have those PNG files still on my computer, or if it actually creates new copies of the images within the .PDN file.
I know some audio software requires you to have every original .wav file to your project saved in the original folder or it won't load your project. So I wasn't sure if Paint.Net worked that way too.
I plan to backup everything eventually, but right now I just need the quickest solution as my computer has been acting up and I'm concerned I might lose everything. So if I can just backup the .PDN files and be sure they will contain all the necessary PNG images to each project, that will work for now, and then I can backup all the PNG files later if I'm able to.