Hi everyone I have a rMBP (2014) that has a lot of photo's/video's and documents. I would like to sync everything onto an external hard drive. I tried the free "synctwofolders" app, but I keep getting errors. For some reason, there are a few folders it just won't copy. I have the synchronization mode set to "source completes target" I would really appreciate suggestions for some other app that works better? Even it is a paid app. Thank you very much!