Need to upgrade from free ESXi

I have a server running the free version of ESXi. This server hosts four guest Virtual Servers, all Windows.  I need to make sure these machines are all backed up, and currently use Acronis Backup & Recovery 10 to do so.  Acronis DOES offer an ESXi agent, but it will not work with the free ESXi.  I would like to be able to backup the entire datastore on the ESXi server to make disaster recovery as simple as possible in the event of hardware failure.  What is the best VMWare product to upgrade to from the free version of ESXi that will allow me to do this, and is it a simple upgrade or a rebuild of the entire server???  Thanks.
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larry urbanConnect With a Mentor DevOps EngineerCommented:
It is just a license that would need to be changed from free(evaluation) to a purchased one from VMware.
tenoverAuthor Commented:
So just purchase the license for ESXi and I'll be good to go after importing the license?
yes, the license is only a key. it does not install anything.
Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:

You only need to upgrade if you do not have the last version from ESXi(VMware ESXi 4.1 Update 1 build 348481). If this is your version, then just added that stated above.

But if you do not want to upgrade, you dont need to upgrade just to install the license key, I am just inform you the latest version and that you can upgrade into that one.

Hope this can help

larry urbanDevOps EngineerCommented:
Correct. Just a license install (and all updates are always recommended).
tenoverAuthor Commented:
Thanks everyone. Just purchased VSphere Essentials Plus.
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