• Login to WebUI -> in the sidebar go to Hass.io -> snapshots
• Here your can create a new snapshot
• after clicking the reload button (upper right corner) you can download your snapshot

• Put the following in your automation.yaml

- alias: Create hourly backup
  trigger:
    - platform: time_pattern
      minutes: '/60'
  action:
    - service: notify.mobile_app_iphone_your_name
      data:
        message: Hourly Backup 💾 is created!
        title: Backup
    - service: hassio.snapshot_full
      data_template:
        name: >
          Backup_{{ now().strftime('%d-%m-%YT%H-%M-%S') }}

• Create new backup user on your server
• Add the user to the allowed group of ssh users in /etc/ssh/sshd_config
• sudo systemctl restart sshd
• Create new ssh key for hass.io
• Add new ssh pub key to ~/authorized_keys
• Add this repo to your plugins https://github.com/carstenschroeder/hassio-addons

Addon config:

{
  "ssh_enabled": true,
  "ssh_host": "192.168.178.27",
  "ssh_port": 22,
  "ssh_user": "ms-backup",
  "ssh_key": [
    "-----BEGIN OPENSSH PRIVATE KEY-----",
    "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
    cat ~/.ssh/hassio-key
    "ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ",
    "-----END OPENSSH PRIVATE KEY-----"
  ],
  "remote_directory": "/hpdata/homes/ms-backup/backup_hassio",
  "zip_password": "",
  "keep_local_backup": "48",
  "rsync_enabled": false,
  "rsync_host": "",
  "rsync_rootfolder": "hassio-sync",
  "rsync_user": "",
  "rsync_password": ""
}

• Add your new private key to the configuration above
• create a new automation in automations.yaml

- alias: Offside backup
  trigger:
    platform: time_pattern
    minutes: '/60'
  action:
  - service: notify.mobile_app_iphone_your_name
    data:
      message: Offside backup 💾 is created!
      title: Backup
  - service: hassio.addon_start
    data:
      addon: 36883ed7_remote_backup
      #      ^- to get the propper ID go to hass.io -> Addons -> Remote Backup 
      #         I couldn't figure out where this ID comes from

• This will trigger the remote backup addon. After the backup is done the state of remote backup goes back to stopped till it is triggered the next time. While testing this did not worked for very short intervals < 3 Minutes. For longer intervals it works like expected.