You can always back them up like Astrologer mentioned.
If you don't have it already, winrar is great to have on your computer for many reasons.
If you do have it, I can suggest zipping the folders you want to keep, and uploading them to either dropbox or mediafire.
Thus incase your hard drive gives in as well, the files will always be available later.
If you don't wann go through the hassle like I reccomend you do, just move those wanted folders out of the Feralheart folder.
Keep in mind that if you are re-installing the game due to any glitches, these may continue if you move some folders back.
If you're having issues with crashing after downloading or exporting a map, check for duplicate particles.