Possible route from 2008 r2 to 2012 r2 Essential on different machines?

I have a Windows server 2008 r2 standard on a machine and we bought a new server.
I want to transfer all my users, groups, machines from the 2008 r2 machine to the new 2012 r2 Essential machine.
I've read the Migrate from Previous Versions to Windows Server 2012 R2 Essentials and
Migrate Windows Server 2012 Essentials to New Hardware article but I'm still not sure this can be working with the 2008 r2 standard too.
If it doesn't work, restore a system state backup on 2012 r2 from 2008 r2 is possible? Or Is there a method to transfer my users and computers?
Is it possible that after I demote the original server, I rename the new server to the name of the old server?
I have an SQL server instance in the source server. This and the user profiles are the only things I want to transfer.
Thank you!
Tamas

It is not as simple as that with an Essentials server as it also runs a certificate authority, and the Essentials features are heavily tied into that.
Robert Pearman SBS MVP
itauthority.co.uk |
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    ......................... Configuration passed test CrossRefValidation
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        Fully Qualified Account Name:    -
        OS-Version:            -
        Called Station Identifier:        -
        Calling Station Identifier:        44-37-E6-C0-32-CA
    NAS:
        NAS IPv4 Address:        192.168.1.1
        NAS IPv6 Address:        -
        NAS Identifier:            -
        NAS Port-Type:            Ethernet
        NAS Port:            1010
    RADIUS Client:
        Client Friendly Name:        Extreme X440
        Client IP Address:            192.168.1.1
    Authentication Details:
        Connection Request Policy Name:    Secure Wired (Ethernet) Connections 2
        Network Policy Name:        Secure Wired (Ethernet) Connections 2
        Authentication Provider:        Windows
        Authentication Server:        Sigma.faithchurch.net
        Authentication Type:        PEAP
        EAP Type:            -
        Account Session Identifier:        -
        Logging Results:            Accounting information was written to the local log file.
        Reason Code:            16
        Reason:                Authentication failed due to a user credentials mismatch. Either the user name provided does not map to an existing user account or the password was incorrect.
    ========================================

    Hi,
    Have you added the NPS server to the RAS and IAS Servers
    security group in AD DS?
    The NPS server needs permission to read the dial-in properties of user accounts during the authorization process.
    Try to add a loal user on the NPS server, then test with the local user. If it works, it means that there is something wrong between NPS and DC.
    If the issue persists, it means that the configuration between NPS and NAS is wrong.
    Steven Lee
    TechNet Community Support

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