Jeremy Stanley writes:

 > It's all stored in a relational database,

This isn't quite true:

- order of shutdown matters because you want to be sure queues are
  flushed
- several queues (bad, shunt, queues internal to archiver plugins,
  specifically HyperKitty) do not get flushed (bad cannot be flushed)
- some database items (eg, custom templates) get cached on disk, and
  people sometimes modify them on disk and/or add new template
  directory to the template search path

 > which you should be able to extract with a tool like mysqldump and
 > then later source that same dump into a new empty database.

This is often unnecessary.  If you're going to be running the new
Mailman on the same host, you can probably keep the old database
running, and point the new Mailman applications to it.

 > You can find some information on database setup in the documentation 
 > here: 
 > https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/database.html
 >  
 > Some familiarity with backing up, restoring and manipulating 
 > databases is a big help for these sorts of tasks, otherwise it may 
 > have a fairly steep learning curve.

Let me second Jeremy's advice above.  Consider the skills you have
available to you when deciding how to do the migration, and feel free
to discuss your plans here.

-- 
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source    https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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