"bench backup" doesn't now about the arguments "--only", "-i" or "--include"

[Mutantpenguin]

Description of the issue

The documentation says that "bench backup" knows about the arguments "--only", "-i" or "--include". https://frappeframework.com/docs/user/en/bench/reference/backup

These are no commands/arguments from bench itself, but I think should be defined by frappe.

All 3 arguments are not recognised.

Context information (for bug reports)

Output of bench version

erpnext 12.21.0
frappe 12.18.1

Steps to reproduce the issue

1. bench backup --only 'Address'

Observed result

Output: Error: no such option: --only

Expected result

Working backup with only the stated DocTypes.

Stacktrace / full error message

Usage: bench  backup [OPTIONS]
Try "bench  backup --help" for help.

Error: no such option: --only

Additional information

OS version / distribution: Ubuntu 18.04

Frappe install method: Easy Installer