Do you know what is VSS? and how it works? Do you know how exchange backup will happen and what technology it uses? Do you know why and how exchange backups generally take less time(you can freezing and unfreezing events in eventlogs) when the databases are too big sizing in GBs?
To get all you questions answered, you must read below two nice articles from “The Exchange team blog”. They explained how VSS backup works? what is a snapshot how you will be able to revert to a given snapshots, etc.
Don’t miss them and do read them 🙂
Part 1: http://blogs.technet.com/b/exchange/archive/2012/06/04/everything-you-need-to-know-about-exchange-backups-part-1.aspx
Part 2: http://blogs.technet.com/b/exchange/archive/2012/06/14/everything-you-need-to-know-about-exchange-backups-part-2.aspx
Hope this helps and happy learning…