Backing up Exchange Databases from a DAG

Hi,

We currently have a DAG with two CAS servers (EX1 and EX2), two database servers (EX3 and EX4) and one off-site server (EX5) that has all roles installed in case of a DR scenario. There are two Mailbox Databases, both currently mounted on EX4, with EX3 getting preference if that fails over. Backup Exec sometimes throws theese errors when backing up the mailbox databases:

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