Hi Mate - CWMS uses different storage method for backups than the CUCM/CUC etc. You need NFS storage for CWMS as thats the only supported storage method.
Please refer to below link for more information:
http://www.cisco.com/c/en/us/td/docs/collaboration/CWMS/2_5/Administration_Guide/Administration_Guide/Administration_Guide_chapter_01110.html#task_4A68696836634ECDADFE4B8223540617
Use the storage server to back up your system and store meeting recordings. During a Disaster Recovery (see Disaster Recovery by using the Storage Server), these backups can be used to restore the system. (The supported storage method is Network File System (NFS)).
Before You Begin
Make sure that you configure your Unix access privileges so that your system can store user-generated content and system backups.
On Linux-based storage systems, this depends on the configuration of your read/write permissions for anonymous users for a specific directory to be used for your Network File System (NFS). (See Connect a Linux Client to the NFS Share.)
On Windows-based storage systems, this depends on the Network Access: Let Everyone permissions apply to anonymous users setting. In addition, you must provide the Everyone user group read and write permissions for the NFS. (See m_ConfiguringNFSShare.ditamap.)
Here is the link to configure NFS for windows server: https://technet.microsoft.com/en-us/library/cc770569.aspx
If you have linux server just Google setting up NFS for linux. Once setup create the rights as mentioned above and configure the NFS mount in the CWMS and you should be good to go.
-Terry
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