What hardware to choose for a home NAS?

Question

Do it yourself

Hello, there is a desire to build your own NAS for home use:
- Photo storage;
- Documentation;
- Time Machine;
- Collection of films;
- Torrents
The main purpose is to backup and save data.
There are also several PC, Mac, iOS devices. It would be desirable to organize access to the data from all of them.
I look towards the organization of RAID6 (still questionable, but I want to be sure that in which case the data will not disappear). 4 disks of 2 TB each (have not yet decided on the size to the end).
I think to stuff all this into mini-ITX ( such or such )
But now the problem is with the hardware. Which components to choose to provide at a sufficient level:
- reading / writing - watching
HD / Blue-ray movies over the network
- Hot-Swap (optional)
Interested in:
- Motherboard
- Processor
- Number of RAM
aside: Hitachi Deskstar 5K3000 or Hitachi Deskstar 7K3000, but this article from Habr confuses about the impossibility of including ERC in them (what do you think about this)?

Answer 1

-Guess what processor I need?
- You need celeron j1900.
-I didn't guess!
The essence of all topics about the choice of iron.

Answer 2

If the question is academic, that is, you want to tinker with it yourself, assemble your own for yourself, then probably your question makes sense, but if you consider it from the point of view of a useful piece of iron with a certain functionality, I took a ready-made solution, yes, it’s expensive, but time is more expensive.
PS: and by the way, since we are talking about habré, then this topic has been procrastinating there more than once.

Answer 3

Choice of hardware for a home server? in my answer and a link to the corpus is in the comments