I have a data storage server (running Windows Server 2012 R2) That I like to make off site backups of the data on it. Currently When I want to make a new backup I wipe the backup drive and copy and paste everything over. This works but the problem is that I have around 1.5 TB of data so it takes about a day to transfer everything. I was hoping to be able to just basically update the changes since the last back up. A program I used once before called Synctoy was able to do that but I'm not sure it would be able to handle anything on this level.
Any suggestions for programs that would allow me to update a back up drive with the latest changes?