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Refer to the following instructions to restore your Exchange database in Database Availability Group (DAG).
The database restoration is required to restore on the active database only. You can identify the Exchange server with the active database from the Exchange Management Shell.
Type the following command in the Exchange Management Shell.
Get-MailboxDatabase | ft name, server
It will show which Exchange server is hosting the active mailbox database, i.e. Mailbox Database 01 and 03 are hosted on EX1, while Mailbox Database 02 and 04 are hosted on EX2.
[PS] C:\>Get-MailboxDatabase | ft name, server Name Server ---- ---- Mailbox Database 02 EX2 Mailbox Database 01 EX1 Mailbox Database 03 EX1 Mailbox Database 04 EX2