I was afraid, that it would be the answer.

I cant seem to find a way, to map the database_guid to the info from the sys.dm_database_backups table - if you have...

Same as Normal DB / secondary server.

In Always on of you change primary DB with backups, do the same in secondaries too after stopping Always on traffic and start...

Even if it is Always on , hope you are going with Full backup , Diff Backup and Log backups for any recovery in Primary server.

I hope DBA will...

I believe contained database has the stored credentials and validation done on DB end. So you don't need system databases or users to be created.

MS brought in contained Db's...