Budget storage+disks +-100 000 RUB
For the money only are storage disks the required volume 50% -100% of the initial amount. At this price it will be a piece of iron, without duplication, that still pulls slightly to the storage layer.
Apparently, we need not storage industrial level, but just a cool NAS.
I can recommend the following method:
purchased the computer under "server". Emphasis is placed on the CPU (faster is better) memory (more is better) (ESS) disks. In the select disks need to strike a balance between speed, reliability, volume.
purchased two pendrive 4GB
Received iron set Nas4Free system on a USB flash drive, and the drives rises zfs array.
Puller, cut them on the moon right amounts.
And then on the iscsi we give all of this farm in the hypervisor.
This sum will meet, tasks to solve.
ZFS is not so scary as it seems, well, to back up data on external small nas on raid1 can not hurt.