Begin a backup if one is not already running

tmutil startbackup

Run the backup in a mode similar to system-scheduled backups

Wait (block) until the backup is finished before exiting

Allow automatic destination rotation during backup

destination id

Perform the backup to the destination corresponding to the specified ID

Name	Description
`-a, --auto`	Run the backup in a mode similar to system-scheduled backups
`-b, --block`	Wait (block) until the backup is finished before exiting
`-r, --rotation`	Allow automatic destination rotation during backup
`-d, --destination <destination id>`	Perform the backup to the destination corresponding to the specified ID