I need a (free if possible) tool to sync my HD - or really just several folders, including subfolders (from C: and D:) - to my backup HD that I just connect every now and then.
Is there a smart tool that has no problem with some of the source folders being written to while running? (i.e. it should just copy what it finds in that moment and not care over more changes after that moment)
Over the years I saw a few of these programs, but since I never needed one before... your help is appreciated!