I think you have some pretty big misconceptions which accounts for at least half your skepticism. Most databases are designed to restore from information that's

I think you have some pretty big misconceptions which accounts for at least half your skepticism. Most databases are designed to restore from information that's stored on disk. If you use host volumes, there is no concept of a container "moving around." Just being dead or alive. If a container starts on a host that was previously running, that container now is the previous one.