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https://blogs.technet.com/b/exchange/archive/2012/06/04/everything-you-need-to-know-about-exchange-backups-part-1.aspx
https://blogs.technet.com/b/exchange/archive/2012/06/14/everything-you-need-to-know-about-exchange-backups-part-2.aspx
https://blogs.technet.com/b/exchange/archive/2012/07/09/everything-you-need-to-know-about-exchange-backups-part-3.aspx