[feature] Add possibility to save the backup per command

[update-freak]

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.

[dgtlmoon]

what about copying the docker volume instead? its not really necessary to have a special command because its just updating the datadir directly

[dgtlmoon]

bash -c "tar cvzf /backup.tgz /datadir; " also for example

[update-freak]

yes, indeed. Then I will use your command. thanks.