Eventually lot's of people do not feel comfortable with the use of command line on a Mac
. Syncing folders, such as you local mac partition and an external driver or a NAS driver is a very common task. After experimenting with various potential solutions I ended up using the famous rsync command via command line. Yesterday though, I found arSync a very nice GUI front-end for rsync. It really works it offers saving presets, providing logging etc. I have tested it with a local photos folder which I regularly backup on my NAS! So...arSync thank you!Highly recommended!