Add event log tag for server-prompted reset of backup data

2823 backup_agent_failure (Package|3),(Message|3)

2824 backup_package (Package|3),(Size|1|2)

2825 backup_success (Packages|1|1),(Time|1|3)

2826 backup_reset (Transport|3)

2830 restore_start (Transport|3)

2831 restore_transport_failure