Why can’t I backup the mirror database?

I'm currently working with a customer who had a requirement to backup the mirror database.  You may wonder why they want to do this - there are a number of reasons which I won't go into right now.  The simple answer is that it is not possible to backup the mirror database as it is in a recovering state.  It is not even possible to use any SAN-based solution to take a clone/snap due to the same reasons.  What I mean by this is that whilst it may be possible, it will not be supported and the database consistency cannot be guaranteed.

Maybe a feature request for Katmai+1?

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