Is there any type of configuration option for proton drive to periodically back up a specific file, as opposed to backing up only files for which the date/time/size has changed?

For an encrypted container such as created by truecrypt or veracrypt, the date/time/size don't change even though the contents of the container are modified. Is there a way to configure proton drive to, for example, back up a specific file once a week?

Thanks