I really like truenas for nas but I agree with you on running vms/docker somewhere else. I ended up keeping truenas for the mass storage (the only thing I run on it is one virtual machine to hold proxmox backupserver on an ivol). I think the much better home platform for vms is proxmox. You get ar eally nice gui that makes everything pretty easy, it’s debian under the hood and with proxmox backup server you can very easily backup your virtual machines. It’s also very easy to mount nfs or cifs shares into docker containers so you can keep the bulk data of your docker environment directly on the nas, which makes managing backups dead simple.