FreePBX allows a system backup of voicemails, system recordings, system configuration, CDRs, and Operator Panel configuration to be taken. Backups can be taken on a one-off basis, or a scheduled basis.
Backing up voicemail will back up all the voicemail messages and outgoing voicemail greetings for all the users configured on the system. If this is not backed up, then all the users will have to re-record their greetings, and they will be unable to retrieve historical voicemails which were received before the failure.
Backing up system recordings will back up all the voice prompts and custom music on hold recordings. Without this backup, prompts for IVRs, follow-me, queues, and music on hold recordings will all have to be re-recorded or reuploaded after a system failure.
Backing up system configuration will back up all the configuration data. This includes all of the configuration data for trunks, users, devices, IVRs, queues, time conditions—pretty much all the configuration data...