Disk Station DS212j from Synology is a popular NAS-server with space for two internal harddisk drives and possibility to connect more via Usb ports. RAID1 disk mirroring also functions well. The network connectivity handles up to 1000 Mbit/s. Released in 2011.
The best price for Synology DiskStation DS212j right now is £167.99. PriceSpy compares deals and offers from online and local shops.