You will need to make a cold image of the server. I don't believe you can hot image a server os with ghost. I know that with client os's you can run the ghost32.exe and it will work but with a server this is another story. Because it is a cold image the server will be shut down durring the image creation so Mac's point is valid but won't matter because the server will be shut off first.
There are better server back up programs out there if you need to take hot images and especially the database needs to be saved. May I recomend Backup Exec System Recovery for the job as it can take live images and can deal with databases. (not sure specificaly with Oracle Database 11g-R1, so you should call and ask for a pre-sales technical support case so you can talk to tech support before you buy)
cheers,