[ogou]

One thing Dropbox does well is transparently resuming a stalled or failed sync. The other solutions I can think of are more manual or the UX is very basic or obtuse. You could set up your own storage space on AWS and rsync (which has GUI tools available), but that's essentially roll-your-own Dropbox.

I work on large video files that I transport between locations and had an external drive that I used for a while but would end up forgetting or not wanting to unplug everything. I have settled on a high speed 64gb SD card that fits in any pocket or even my wallet. Out of all the fancy network tools I set up, this option has proved to be the most enduring.

Doesn't help with synchronizing which files are most current though. You might look at Transmit 5 from Panic. It has lots of useful syncing features now.