> Can I backup my container configuration to a json file on disk or do I still need to sync it to the cloud to save it?

I will guess the ability to save containers locally must be possible, based on this: Every night, my desktop ffx profiles are copied over to a VM. The VM hosts firefox as a remote app.

That remote app instance of ffx has all of my sessions and saved passwords. I can access it from anywhere over VPN and they never leave the house. I'm typing on it now.

Included in that are all of my containers - so in theory they're transportable. I've never thought to try to isolate them from the profile - but my gut says it should be possible.