It's rare for a NAS device to ace all three categories, but QNAP's TS-251 NAS comes closer than just about any two-bay SOHO NAS I've tested.
The TS-451 really demonstrates its superiority when you consider its multimedia capabilities. Built-in transcoding functionality really enhances its position.
I can report that the system is thoroughly and completely epically awesome.
Your Private and Secured Cloud
Easily setup, backup and share
When you hear terms like "cloud" or "cloud-storage", you generally don't overthink it, and end up using it without knowing how it works. With the QNAP, imagine it being your personal or private cloud and your files are safely stored at home for you to access anywhere and anytime.
Backup Your Files Like Never Before
Compatible with PC, Mac, and external devices
Your personal cloud should still act as a storage device. Instead of backing up to countless external hard drives, you could simply schedule backups from your designated folders to the NAS. You have many backup options such as RTRR, Rsync, Time Machine Backup, USB one-touch copy, and cloud-services backup such as Dropbox, Amazon S3, Microsoft Azure and more!