Lync Enterprise with Single BE Server and Voice Routing

Hi team,
I read that the best way for a HA topology is to go ahead with 3 FE server pool(Although MS has said it's workable, many recommend not to). Now this leaves me with another problem, can I go ahead with just 1 SQL Back-End server. I know in this case SQL will
have no failover. But if we ok with the downtime, will it work properly when the BE is up?
The front-end includes the following:
Basic Lync functions
Mediation
Monitoring
Archiving
Thank you.
Chris!

Hi Crypto_J,
After the Back End Server is up, you could verify if the services of Lync Servers are normally started, and take a test.
For more details about restoring the Back End Server, please click on the link below.
Restoring the server hosting the Central Management store in Lync Server 2013
http://technet.microsoft.com/en-us/library/hh202172.aspx
To ensure high availability for your Back End Servers, you can use either synchronous SQL mirroring or SQL clustering.
Using one of these solutions optional, but is recommended to maintain your organization's business continuity.
Best regards,
Eric

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