I currently have an Odroid H4C that has two SATA with two 12TB hard drives.

It's starting to get too small, so I was thinking of taking the step and move to a 4/5 bays NAS and reuse the disks (the other option was to add disks via USB).

What NAS do you recommend me to continue being able to have my *ARR suite + torrent + nextcloud + syncthing + small services(gitea, trillium notes, etc)?

I would like to already have some redundancy, can I use the hard drives as they are or will I have to do something to them besides adding other hard drives? (my idea was to add one more disk of 12 to have redundancy and already expand space with a fourth disk)

Edit:

I wan't to buy and forget, so no to build myself.

I really don't think in any budget, but as cheat as can be, without loss any funcionality that i stated before.

I run my services mostly in docker

Currently stream in my lan without any web, in samba folders but jellyfin could be interesting (not Plex, trying to FOSS to maximum)

The redundancy is for data safe

Thanks for your answers