My storage systems have grown to keep up with storage needs. I am currently running two NAS units in RAID-5:
Unit #1 for client audio projects is a Netgear ReadyNAS NV+ with four 1500 GB drives, providing about 4.3 TiB of storage.
Unit #2 for personal projects and general data is a Thecus N5200 Pro with five 1000 GB drives, providing about 3.6 TiB of storage.
These two units are then duplicated off-site and connected by a fibre optic link (currently running at 100 Mb/s while the rest of the network is running at 1000 Mb/s).