Do you need that? If you want your own replicated storage cluster at home, you can use Ceph. I've seen Ceph deployed to utilize the spare hard drive ports in server clusters that otherwise mostly do compute (transcoding), alongside memcached to utilize the RAM, etc.

I'd bet the majority of projects, but perhaps not the majority of traffic, can run adequately on a single server and tolerate a few hour maintenance window one weekend every month. Don't waste money on overkill.