For a single user, JustCloud gives the best bang for your storage bucks: $9.95 per month for unlimited storage. You can sync and share files across Macs, Windows, Linux machines, iPads, iPhones, Androids, and more. On the security side, JustCloud encrypts data transfers using 256-bit SSL encryption. On the corporate front, business plans start at $20 per month for up to five users. There is a con skulking among all these pros, though: As of this writing, JustCloud lacks tech support over the phone. That may not be a biggie for you.