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Why does DPM dismount an entire Exchange Server storage group for database recovery while NTBackup does not?

April 26, 2017database dismount dpm entire exchange group ntbackup recovery server storage

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Why does DPM dismount an entire Exchange Server storage group for database recovery while NTBackup does not?

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Exchange Server has two technologies for backup and recovery; streaming application programming interfaces (APIs) and the Volume Shadow Copy Service (VSS). Streaming APIs allow you to recover a database without taking the entire storage group offline. The Microsoft Exchange Server writer uses VSS, which requires the entire storage group to be offline, even for a single database recovery.