@juezdred I think RAID 5 is quite balanced for having 3 or 4 disks. It depends a lot on your storage needs and data security. In the end, the RAID level depends a lot on what you want. If with 2TB you think you will have enough, RAID 1 can serve you. If you want the possibility to expand and maintain some redundancy, RAID 5 is a good option.
I've been using a home NAS for a couple of years that runs on OpenMediaVault and it works perfectly. I have a RAID 5 set up. A few months ago, a hard drive failed and I was able to rebuild the volume without any problems. And recently I expanded it (from 3 to 4 disks) and it was quite simple. In essence, I have experienced all the more or less delicate operations without any surprises.
Then you have FreeNAS (which seems to now be called TrueNAS) which, due to its use of ZFS, has some pretty interesting features like compression and deduplication. Depending on the type of data you are going to put in, you can save a lot of space, but it has some drawbacks like it being more difficult to expand.
In my case, what I wanted was simplicity, reliability, stability and ease of expansion, OMV was what I was looking for.