First, it seemed to work, I had to change the name of the other (non-server) computer to the name of my own Win2008Server, then I could configure everything.
But when he wants to perform his first backup, he exits with a ServerError2 and when I then want to reconfigure I have my error where he tells me the MozyHome license isn't supported for Server Systems.
We should find a way to fool Mozy in telling that this PC is not a server system...
I tried it and it happens when you run the MozyHome Remote Backup Configuration Wizard. Isn't it possible to run this wizard on an other computer (and check the 'Remember my password' checkbox), export the key HKEY_LOCAL_MACHINE\SOFTWARE\mozy from the registry (start -> run -> regedit) and import it into your Windows Server 2008 computer? Probably then it's possible to skip the wizard and let's hope this check isn't also added in other sections of the program.
Hope for you this works, let me hear it!