Is the nas intended as the sole backup? Raid 5 will only protect against hard drive failure, not against the sata controller dying and killing drives, or the psu doing likewise, or good old user error. I'm sure you know this, but feel compelled to quote "raid is not a backup" in case.
I've been using an amd 7750be as the basis for a two drive nas for months now, running ubuntu server. It's been tediously reliable, runs backups based on rsync at whatever intervals it's told to. Rsync is extremely capable. Samba is pretty reliable so a linux based system is a viable alternative to windows home server, if you run something like Debian on it you can expect it to run forever without any signs of crashing and never needing a reboot.
As a cost cutting exercise you could buy some 1.5tb drives, rip the current ones out of their enclosures and put them all into a tower. As far as the rest of the hardware goes a cheap dual core would be ideal, possibly look into teaming two gigabit connections from nas to the switch, so that simultaneous backups still run swiftly.
I've been using an amd 7750be as the basis for a two drive nas for months now, running ubuntu server. It's been tediously reliable, runs backups based on rsync at whatever intervals it's told to. Rsync is extremely capable. Samba is pretty reliable so a linux based system is a viable alternative to windows home server, if you run something like Debian on it you can expect it to run forever without any signs of crashing and never needing a reboot.
As a cost cutting exercise you could buy some 1.5tb drives, rip the current ones out of their enclosures and put them all into a tower. As far as the rest of the hardware goes a cheap dual core would be ideal, possibly look into teaming two gigabit connections from nas to the switch, so that simultaneous backups still run swiftly.



