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OpenMediaVault
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I would personally go with a single refurb server (like Dell R720 or HPE analogue), fill it with resources, install the hypervisor, and run your applications and NAS in the VMs. You can reuse your old microservers as the backup target. As per OS, if you want to do it by yourself I would recommend Ubuntu server 22.04, configure RAID by using MDRAID, ZFS or hardware RAID (if you will have one), and play with iSCSI (LIO), SMB (Samba) and NFS (native) sharing. Or you can stick with FreeNAS (virtualized) or try out something new like Starwinds SAN&NAS (https://www.starwindsoftware.com/free-san-and-nas) or OpenMediaVault (https://www.openmediavault.org/)