How to sync/backup 2+ server's networks + members?

[PizzaProgram]

It is possible to create multiple self-hosted servers (planets), which is great!

But is is not clear from documentation, how to configure to:

• Synchronize between those?

So, if I deploy planet files, which contains multiple of these (dockerized) servers:

• they all appear as different entities,
• and does not seem to sync all networks & members.

Also:

• How to backup/restore the whole server with all the members?

(Asked this at the discussion, but got no answer. That's why I open an issue instead, so it gets included in the docs.)

[sinamics]

You should only use one controller. Networks and members will not sync between multiple roots.
Multiple root servers are useful for better peer-to-peer discovery, especially if you operate in different regions, as well as redundancy for peer discovery if one goes down.

Would recommend this article:
https://docs.zerotier.com/roots/

If you need redundancy for the controller, you should set up a fallback server that can take over if the main controller goes down.

For the backup, you can do something like this ( not tested )

# First stop your containers
docker compose down

# List your volumes to find the correct names for zerotier and postgres-data.
docker volume ls

# Backup PostgreSQL data (replace VOLUME_NAME with your postgres volume name)
docker run --rm -v VOLUME_NAME:/source -v $(pwd)/backup:/backup alpine tar czf /backup/postgres-backup.tar.gz /source

# Backup ZeroTier data (replace VOLUME_NAME with your zerotier volume name)
docker run --rm -v VOLUME_NAME:/source -v $(pwd)/backup:/backup alpine tar czf /backup/zerotier-backup.tar.gz /source