Can I install the Windows Server Essentials Experience after a server is already setup

I have a windows server 2012 R2 as the secondary server with a SBS 2011 as the domain controller.
I have serveral databases running already (Act, Sage 2015) and a shared folder.

I would like to know if I can add the Windows Server Essentials Experience role to the 2012 R2 without having any issues...

The reason is My client wants to use it to back up his LAN PC's.

Anyone know if adding this will cause any issues? or can I even add it now...  I am new to the 2012 servers; have been working with the Small Business Servers all along...

Thanks in advance for any info
Richard TPresidentAsked:
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Cliff GaliherCommented:
If it is already an application server then I would not add the essentials role. That makes some fairly significant changes, and client backup is CPU and I/O intensive since it dedups. You'd potential break the apps and most certainly slow then significantly. If you had very high end hardware, that's where virtualization could really pay dividends by splitting off a separate instance
Cris HannaSr IT Support EngineerCommented:
I agree with Cliff.  Is the primary reason to get client backup?  Then look at Storage Server Essentialside 2012 R2
Robby SwartenbroekxMSP engineerCommented:
Veeam (known from virtual backups) now has a very good (free) backupsolution for standalone pc's, Veeam Endpoint. If this is the only reason to install this role.

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Richard TPresidentAuthor Commented:
Thanks for the quick feedback..  I felt that would be the way to go but the client was dead set on using the 2012R2 server.  Now I have info that I can use to change his mind....
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Windows Server 2012

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