Hello Neil. Thanks you for you answer.
Checked the prices of the services you told me, and you´re right that is better to have an extra drive. Is cheaper and faster.
Got a 4TB USB 3.0 extrnal drive at a good price and backing all up there. Im going to try Resilio, I had been using the Folder Syncronizer App but takes an eternity to check the already copied files on my drive.
Thanks