Exchange Server 2013 backup and restoration question

Good afternoon
I am wondering if I can pick people's brains here if that's not too much trouble.
I have recently implemented an Exchange 2013 environment with 3 servers (two multi-role CAS & MBX physical machines, and one further virtual CAS server). Everything is working correctly and mail-flow is fine. My question relates to backup and restoration
procedures. I am running a single Database Availability group with the two multi-role servers members of the this group and I have one Mailbox Database on the DAG, passive on one member and active on the other. Failover has been tested and this is functioning
as expected.
The backup environment I have implemented is as follows. I have utilized a separate Microsoft DPM 2012 server that runs a nightly Bare Metal backup on both multi-role servers with a retention range of 14 days and I have protected the DAG using DPM with a
nightly full-express backup and 4 hourly syncs on one of the multi-role servers. Furthermore the Mailbox Database is protected, again nightly with a copy-backup.
I am confident I know what to do should the mailbox database become corrupted or lost or need to be restored for one reason or another (it would just be a case of restoring the backed up mailbox database using DPM to a pre-created recovery database), what
I am not quite so sure on is what I would do should I lose one or both of the multi-role CAS and MBX servers (the third CAS I am not so worried about as it is not used for incoming mail flow from the internet and we really only use it for ECP as we did not
want to expose this to the internet). I wonder what process should follow to restore my Exchange servers (I know how to perform the Bare Metal recoveries using WSB) and what configuration would be required after restoring the Bare Metal backups.
I know this is a reasonably long question but if anyone has any advice for me I would appreciate it greatly in the unlikely event something goes horribly wrong with my Exchange environment.
Thanks in advance

Hi,
Yes, Most of the configuration settings are stored in AD. Mail data and personal related data are store in Mailbox DB. We just need to take consideration of these two points.
Thanks,
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