I have close to 10TB of data on my home server and the most cost effective solution I could come up with was to build two servers the 2nd one mirrors the data of the primary using DFS (Microsoft Distributed File System). Neither server uses RAID for redundancy, just Spanned disks. This makes it more cost effective because I'm not wasting a drive on each server for parity. If I lose a drive I can replace it and restore the data from the mirrored copy on the other server. I probably have a more elaborate hardware setup than most because I tend to do a lot of testing using Hyper-V and VMware. The backup server is a small and efficient Mini-itx system in a Chenbro SR30169 compact server case with 4 hot-swap bays. Even with 16GB of RAM, Core i5 4570S CPU, 120 SSD, and 3 SATA drives it only draws 40 watts from the wall. The primary server is more powerful ATX system with an 8 core Xeon CPU, 64GB RAM, SSD, 3 SATA, but still only draws 60 watts at idle using a gold rated power supply helps.
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I have close to 10TB of data on my home server and the most cost effective solution I could come up with was to build two servers the 2nd one mirrors the data of the primary using DFS (Microsoft Distributed File System). Neither server uses RAID for redundancy, just Spanned disks. This makes it more cost effective because I'm not wasting a drive on each server for parity. If I lose a drive I can replace it and restore the data from the mirrored copy on the other server. I probably have a more elaborate hardware setup than most because I tend to do a lot of testing using Hyper-V and VMware. The backup server is a small and efficient Mini-itx system in a Chenbro SR30169 compact server case with 4 hot-swap bays. Even with 16GB of RAM, Core i5 4570S CPU, 120 SSD, and 3 SATA drives it only draws 40 watts from the wall. The primary server is more powerful ATX system with an 8 core Xeon CPU, 64GB RAM, SSD, 3 SATA, but still only draws 60 watts at idle using a gold rated power supply helps.