Which server does Cisco recommend that you configure before a CUCM backup?

Cisco DRS exclusively supports SFTP (Secure File Transfer Protocol) as the remote storage destination for CUCM backups, because it provides encrypted transfer of sensitive configuration data. FTP is explicitly not supported due to its lack of encryption, making SFTP the required preconfiguration step before initiating any backup job.

FTP is not supported by the Cisco Disaster Recovery System because it transmits data in cleartext, which poses a security risk for backup files containing sensitive system configuration.

SNMP is a network monitoring protocol used for polling device status and receiving traps - it has no role in the CUCM backup and restore process.

TFTP is used in CUCM to serve configuration files and firmware to IP phones and gateways, not as a destination for system backup storage.