NAS devices seem one of today's must-haves. Every storage company sells them and some are even specialized in this area. Thecus is one of these companies who specializes in NAS devices, hence their products are solid and future proof.
The N5200 Pro is one of the high end models, hence it doesn't come cheap. In return you get a product that will last for years. It can hold up to five high capacity SATA drives internally and allows expansion via eSATA and USB. Due to RAID the massive amount of data is relatively safe as well. Which is important since it's not easy to backup several terabytes.
Apart from a few small issues the product seems to work great, it's faster than the competition and offers the same features, even though many features have to be added by the user. When in need of a large amount of external storage the Thecus N5200 Pro is something to seriously consider. If you're not on a low budget, that is.