As one of its daily deals, Amazon offers the Netgear ReadyNAS 202 2-Bay 4TB Network Attached Storage, model no. RN20222D-100NES, for $319.99 with free shipping. That's the lowest total price we could find by $139. It features a 1.2GHz processor, 2GB RAM, and access to your data via the ReadyCLOUD mobile app.

Also available is the Western Digital My Cloud 12TB Business Series Network Attached Storage, model no. WDBBAZ0120JBK-NESN, for $589.99 with free shipping. That's the best deal we could find by $198. It features an Intel Atom C2350 1.7GHz dual-core processor, 1GB RAM, two Gigabit Ethernet ports, and Windows and Mac compatibility. Both deals end today.