CmdID / az / az backup / az backup protection
az backup protection enable-for-vm
Start protecting a previously unprotected Azure VM as per the specified policy to a Recovery services vault. Azure CLI reference
4 options Its page in the Azure CLI reference
Options
--disk-list-settingoption to decide whether to include or exclude the disk or reset any previous settings to default behavior--diskslist--exclude-all-data-disksOption to specify to backup OS disk only.--vault-name, -vName of the Recovery services vault.