I would recommend checking out SyncThing first for anyone curious about ownCloud. They have similarities and differences, I found SyncThing suited my needs mor

I would recommend checking out SyncThing first for anyone curious about ownCloud. They have similarities and differences, I found SyncThing suited my needs more personally but there's some stuff that only ownCloud can do. There's also BitTorrent Sync which is cool, but sadly proprietary.