Justification- I prefer my backups on VHD's as they are easier to move/ manage than their physical counterparts.
However, I am going to buy a replacement and one thing is for certain - it ain't going to be a Thecus!
If you're in the market for this sort of thing AND you know your way around Linux, you could consider an HP Micro Server N40L. Much faster CPU, more RAM 250GB drive and allows for 4 drives.
Start by stripping down two old desktop Celeron (or Via C3) PCs and bundle their motherboards into a 3U rack case (stick one mobo to the bottom the normal way up and then the other to the inside of the case top upside-down), put in two low-power desktop PSUs, some fans, some cheap networking cards (most desktop PCs have at least three PCI slots, you will need two LAN cards per mobo for redundant LAN links for the cluster) and a SCSI card per mobo (old Adaptec cards are always on e Bay and usually work fine with Linux).
Then add some SCSI disks (best four per mobo, total eight), split into two chains off the SCSI cards (you may decide to buy a pair of old SCSI shelves like the hp ds2100, again cheap on e Bay).
I do like the look of this machine though and the drive bays are smart; but without NFS it's effing useless.
Based on a glowing review I purchased a Tecus N2200Plus and it has been an unmitigated disaster. Back in September they told the disgruntled customers that new firmware would be available "in weeks" to fix the issues.With the exact same processor one can also find: * The Netgear Ready NAS NV v2 : a Ready NAS Duo v2 that can accomodate 4 disks * The D-Link DNS-345 which has also 4 HDD bays but 512 Mb RAM instead of 256, but lacks USB 3.0 * The more expensive Synology DS-212 (not the DS-212j), also a 2 bays NAS with USB 3.0 and a SD card reader.For this price you really get a powerful OS with lots of function that you don't have in the Netgear' v2 stuff. ;-) On the tech front, it may be of interest here that a number of Synology NAS boxes run on ARM processors (in the case of our DS110j, a Marvell one), and have done for a good few years.- you have your own highly-redundant "array appliance", ready to serve up NFS to Linux, UNIX and Windows users, probably all for the cost of a few bits off e Bay, missing out on several evenings down the pub with your mates, and a lot of grief from your missus. :) It was all new hardware though - ASUS E35M1-I mini-ITX motherboard (with 6x SATA 3 ports), 4GB RAM, 16GB SSD for OS, CFI A7879 case (with 4 hot swap SATA bays).Running Arch Linux, administered the old fashioned way, none of this web-based interface nonsense ;-) Nice.I was thinking that the specs were a bit stingy compared to the QNAP I have sitting here (2GHz ARM, 512MB of RAM).