Ask HN: Your home server/NAS set up

I'm looking into upgrading my Netgear ReadyNAS duo to something with more HDD bays (>= 4) as well as something more flexible to aid my move away from the cloud.

My main requirements are:

- A backup destination (timemachine/rsync) - A shared file storage space - Run a development environment (web development) - Ability to run a few other servers; gitlab, media, torrents

I was thinking of getting a HP proliant server and running freenas or something similar but the cost stacks up quite quickly. The alternative is to go with a more powerful small-office NAS.

What do people here use at home/small office?