I was pointed here to give a suggestion from this thread: https://www.dropboxforum.com/t5/Dropbox-files-folders/Trying-to-backup-on-Linux/td-p/548352
It would be nice if the functionality was added to (https://help.dropbox.com/installs-integrations/desktop/linux-commands)
Some commands like:
`dropbox backup enable/disable`
and
`dropbox backup add/remove /path/to/folder/or/file`
Currently the advice is to mount into the dropbox folder (https://askubuntu.com/questions/1366889/how-can-i-use-dropbox-to-back-up-arbitrary-folders/1366896#1366896)