Scratching Your Own Itch - Mirror Folders

I always wanted to mirror my work automatically when changes occur. However I do not want to backup my entire hardisk but only the folders I choose. Therefore the application must allow me to select which folder to watch and where will it be mirrored. The locations can be a thumbdrive, external drive or any other mounted storage.

Another problem I have is with the cloud storage where in order to use it I have to save my work in a defined folder. I already have my work in folders that I am comfortable with and do not want to change its locations or structure. To solve this problem, I would mirror the source folder to the cloud folder. As a result, whenever changes occur it will be mirrored to the cloud folder and subsequently to the cloud itself. Furthermore to ensure the safety of my work, I would mirror them to multiple locations.