Connect external HDD through Samba NAS with HA Yellow for TimeMachine Backup

Does anyone have a working config where they’ve successfully connected an external HDD to a HA Yellow and used Samba NAS (or some other method) to expose the HDD as a share for TimeMachine backups on macOS?

On my Mac, I can find the folders/dirs through the “network” but TimeMachine cannot find it:

workgroup: WORKGROUP
username: homeassistant
allow_hosts:
  - 10.0.0.0/8
  - 127.0.0.0/8
  - 172.16.0.0/12
  - 192.168.0.0/16
  - 169.254.0.0/16
  - fe80::/10
  - fc00::/7
automount: true
moredisks:
  - dev/sda
  - dev/sda1
  - dev/sda2
  - dev/sda3
mountoptions:
  - nosuid
  - relatime
  - noexec
available_disks_log: true
medialibrary:
  enable: true
veto_files:
  - ._*
  - .DS_Store
  - Thumbs.db
  - icon?
  - .Trashes
compatibility_mode: false
recyle_bin_enabled: true
wsdd2: false
wsdd: true
mqtt_nexgen_entities: false
autodiscovery: {}
other_users: []
acl:
  - share: backup
    disabled: false
    timemachine: true
interfaces: []
password: super-secret-password

I’ve checked multiple links:

Any many other threads…

Help would be greatly appreciated!