The weird part is that Linux is mostly about the server, being a really good home server for many people. And setting up a home server that synchronizes your files, for cheap with a Raspberry Pi and an external hard-drive, is a no-brainer. It's almost like they don't want people to do that.
But anyway, I'm voting with my wallet as they say. Currently paying €13.98/month for Dropbox, because I included the 1-year versioning add-on.
I also just gave up on 1Password for the same reason, even though I was happy with it on my Mac, switched to KeeWeb + Keepass2Android + MiniKeePass. In some ways it's even better - I now have a full history of all my edits and it can never switch on me or die.