az backup --help Manage Azure Backups.

addaxnasom

This command group is in preview. It may be changed/removed in a future release.

Group
    az backup : Manage Azure Backups.
        This command group is in preview. It may be changed/removed in a future release.
Subgroups:
    container     : Resource which houses items or applications to be protected.
    item          : An item which is already protected or backed up to an Azure Recovery services
                    vault with an associated policy.
    job           : Entity which contains details of the job.
    policy        : A backup policy defines when you want to take a backup and for how long you
                    would retain each backup copy.
    protection    : Manage protection of your items, enable protection or disable it, or take on-
                    demand backups.
    recoverypoint : A snapshot of data at that point-of-time, stored in Recovery Services Vault,
                    from which you can restore information.
    restore       : Restore backed up items from recovery points in a Recovery Services vault.
    vault         : Online storage entity in Azure used to hold data such as backup copies, recovery
                    points and backup policies.