The Messaging administrator can back up the Messaging data over the customer LAN to an external FTP server. In the event of a system failure, the administrator uses the information stored on the external FTP server to restore the Messaging system.
Messaging supports the File Transfer Protocol (FTP), Secure File Transfer Protocol (SFTP), and Session Control Protocol (SCP) backup methods. Messaging data backup might easily reach 50 Gigabytes or more. Customers might be unable to support transfers of single files of this size. Hence, Messaging data backup consists of multiple files, small enough to be transferred in a customer environment. The system administrator who is administers network backups must be aware of the possible file storage sizes and the limitations of the storage size on the customer data network.
A system administrator can limit the user mailbox size of storage so that users do not have more than 10 minutes of voice storage in the mailbox. A system administrator can also limit the number of days a message can remain in a mailbox before the message is deleted.