Backup Akonadi data

If I want to move from one machine to another, but keep all my address
book info etc (and in future all my emails), is there a backup/restore
facility in Akonadi?  If not I would suggest that one is needed - is there
any documentation as to what gets stored where so that one could be
written?

Similarly if I want to synchronise my akonadi data between say a laptop 
and a desktop is there a way to do this?

Also is the format the same independent of the database that is used.  
If so can this be used to migrate from MySql to Postgresql?

David
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