Didn’t know that! I’ll set aside some time during the weekend to do a full Time Machine backup. Just in case this Catalina blows up with its two containersThe new OS uses two APFS containers: one is a read-only system container; second is the data container. You can't see the two containers as separate disks in Finder but you can in Disk Utility.
I'm surprised you haven't got a Docker solution for everythingVMware Fusion