Not only did BrandonM have a point in 2007, today it is even easier and much more advantageous to do file synchronization with Free Software tools. If you have multiple machines you have SSH on all of them already. There is no better solution out there than git together with ediff for versioning and conflict resolution. rsync and unison are great for syncing media files across many devices/USB drives/microSD cards with different filesystems on them. Hardlink or ZFS snapshots just work.
Dropbox is not even an option for me because there is no official support or reliable way to run it on OpenBSD.
Dropbox is a consumer product with limited features and use cases. Smugly dismissing the needs and technical capabilities of power users is not going to endear you to anyone here.