Hi Romain,
Have a look at the following CCM DRS Admin info;
Configuring a Storage Location
Before using the Disaster Recover System, you must configure the location where you want the backup file to be stored. Perform the following steps to configure the storage location.
Procedure
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Step 1 Navigate to the Disaster Recovery System. Log in to Cisco CallManager Administration, choose Disaster Recovery System from the Navigation menu in the upper, right corner of the Cisco CallManager Administration window, and click Go.
The Disaster Recovery System Logon window displays.
Step 2 Log in to the Disaster Recovery System by using the same Administrator username and password that you use for Platform Administration.
Step 3 Navigate to Backup>Storage Location. The Storage Location window displays.
Step 4 ***Choose the number of backup files to store on a network directory.***
Step 5 Choose one of the following storage destination options and enter the appropriate field values:
Tape Device?Stores the backup file on a locally attached tape drive. Choose the appropriate tape device from the list.
Network Directory?Stores the backup file on a networked drive accessed through an SFTP connection. Enter the following required information:
?Server name: Name or IP address of the network server
?Path name: Path name for the directory where you want to store the backup file
?User name: Valid username for an account on the remote system
?Password: Valid password for the account on the remote system
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Note You must have access to an SFTP server to configure a network storage location.
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Step 6 To update these settings, click Save.
Step 7 Continue with either a manual or a scheduled backup.
From this good 5.0(1) doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide09186a008053242c.html#wp153677
Hope this helps!
Rob
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