BitTorrent takes on Dropbox with Sync sharing and backup service
Other services offer similar capabilities, but Sync will be totally free and totally independent of companies and other servers — no middle men means better privacy and no bandwidth or cost worries.
BitTorrent may be associated with piracy, but it's still just a protocol for sending things over the Internet, so you shouldn't have to worry about whether all that BitTorrent traffic will raise an eyebrow at your ISP.
Sync isn't available for use yet, but is being tested for release. You can try to become a tester for early access by signing up here, but it should get a real release in the next couple months.
Devin Coldewey is a contributing writer for NBCNews Digital. His personal website is coldewey.cc.