Backing up freeradius

["Elie Hani" <ehani@wise.net.lb>]

Hi;

I have freeradius configured on Fedora Core 6, I tried to configure a backup
script where I can copy /etc/raddb folder to another server with the same
version and the same operating system.

When it's done, the command service radiusd start did not work, 
But radiusd -x & worked and the server is well functioning.

What could be the problem? 

Thanks
Elie Hani