I have been advised to remove everything from my current computer and reload the Mac0s operating system with a new one. (or scrap my desk top computer and buy a new on) ,. Will my files in dropbox folder, which are automatically synced to drop box be preserved so that I can restore them to the new or repaired computer or do I need to find another back up (to USB?) or a different cloud storage system.What do I need to do to preserve my files?