You have an Exchange Server 2013 organization that contains a database available group (DAG)
named DAG1. DAG1 contains three Mailbox servers named Server1, Server2, and Server3. DAG1
contains a mailbox database copy named DB1.
You implement a lagged copy of DB1 on Server3. The copy lag time is seven days.
You need to ensure that copies of successfully processed email messages are stored on Server1 and
Server2 for seven days.
What should you modify?

A.
The Shadow Redundancy settings

B.
The Safety Net settings

C.
The settings of DAG1

D.
The settings of DB1

Explanation:
Microsoft Exchange 2013 Safety Net is a new feature in Exchange Server 2013 that prevents data
loss by maintaining a queue of successfully delivered messages.
The Exchange 2013 Safety Net is essentially a delivery queue that exists on each Exchange 2013
mailbox server. Each time a message is delivered to a database, a copy of that message is held within
the Safety Net. The message copy remains in the Safety Net until its expiration date, which is
determined by the administrator.