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I have some recovery software and Exchange DAG cluster under protection of it. Should i also add a witness server under protection? Or i can just recreate a witness folder using Exchange Management Shell if it will be lost and everything will be ok?

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You can always assign a new witness server for the DAG if necessary, so it's not critical.

Set-DatabaseAvailabilityGroup -Name MyDAGName -WitnessServer SRV01 -WitnessDirectory C:\DAGWitness
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