Hi

There are no other ideas you need to NFS mount the clone server and copy the datafiles.

If thats not possible then you need to copy over the files to temp location on the standby server on a file by file basis and scp teh files over to the clone server .

Only in 11g you can clone from a live database and in all other versions you need to use the copy of the backup to clone and you need space for that.

regards
Hrishy