I had the same moral objections as you and I've been using btsync (http://www.bittorrent.com/sync) and must admit it works great. My archive is not that big tough, ymmv.
To be honest I won't use dropbox again, even if Rice quits, since btsync is vastly superior for my use cases.
To be honest I won't use dropbox again, even if Rice quits, since btsync is vastly superior for my use cases.