text: Title: [feature] Add possibility to save the backup per command
  Body: **Version and OS**
  Synology DSM 7.2.1 with docker
  
  **Is your feature request related to a problem? Please describe.**
  It would be great to have the possibility to have an automatic export function of the link that his didn't has to be done by hand.
  Therefore it would be good to have an export command, which can be triggered through e.g. synology task manager to do the export e.g. every friday at 01:00.
  
  **Describe the solution you'd like**
  For example for paperless-ngx there is a command like that
  bash -c "docker exec Paperless-ngx document_exporter ../export -z"
  Something similar for Changedetection would be nice.
  
  **Describe the use-case and give concrete real-world examples**
  To have a full automized system also a automatic backup solution would be nice that it is not required to do the backup very time I change something in the list.