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Thank you for the answer. Could you elaborate about the other questions? With btrfs pool, can I restore it on a different hardware in case of a disaster? Where the container and the settings will be stored? Can I backup it and recover in a different pool? What about backing up the USB stick, is there a need for it?

Hello everyone! I consider myself as a skilled NAS user, starting with an old computer with Ubuntu to have some SMB shares and rsync clones, going to a Synology for 6 years (still works) and recently TrueNAS in a low energy consumption custom hardware (R1 Pro NAS - Ryzen 5500U/32GB RAM) for a year with several applications running, until the kubernetes SSD partition failed and the system config or the snapshot restore was not possible due to a "difference in the partition ID". Before TrueNAS I almost went for unRaid, but got cold feet after I found out it runs from a USB stick. Now I'm trying to give it a shot, but I'm having some issues to understand if it will work for my needs. My custom hardware has 2 SATA HDDs and 2 NVME SSDs slots and that's it, there's no more room for another disk. My first plan was to use both HDDs as file storage with one replicating the files to the other once a day, like I always did with my previous NAS. I don't want to have a parity disk or some advanced RAID. I'm okay with having a single hot disk with a cold backup. On the other hand, for the SSDs I would love to have RAID, specially to store the docker applications, their settings and some VMs (Windows and Linux). I tried to do this setup with no luck at all. First it asks for a parity disk, then it's impossible to add the SSD as a regular disk unless I create a pool, but then the pool only works as a cache. I also want to be able to backup the USB stick and the SSD snapshots to the HDD and restore it in case I need it. Can anybody help me to understand if it's possible to setup this with unRaid and, if yes, how? Thanks in advance.