Do you need to do some maintenance to keep the data in the array intact?

I read of some btrfs scrub commands and md checks and such, but I am unsure how often to do them, and what they actually do.

Thanks for the info!

Could you elaborate on btrfs on top of md raid?

This one seems the most likely solution for me.

Powerloss might happen as I don’t have a ups.

And when it comes to mdadm, it just happens to be the first and only redundancy tool I know. I am however open to learn and try new things.

ZFS seems interesting, but: I read that ZFS would require quite a lot of RAM, and I was going for 32 GBs only, would it be enough?

What are the advantages of this over mdadm raid and bcache?

Are there some advantages of btrfs over raid? I understand how raid works but btrfs for redundancy is foreign to me.