The answer to your question would depend on how Drive J is "declared/reported" back to us by Windows.
It may safely Fail (without doing anything else) in either the presence-check or the scan if Windows tells us that there is no drive present.
However, if the device is declared by Windows as being "present, working, but no files" would such a situation cause a problem, although the Warn/Percentage trap will probably catch it if it tries to delete off everything.
Note that this scenario is also applicable in situations where your Drive F (backup) becomes faulty the same way, in which case, the data in Drive J (source) could be potentially be deleted. (Same warn/percentage trap applies if enabled).
It may be better for you if you switch to using a Mirror profile instead (if the backup drive is reported as ‘no files’ by mistake, those 'absence' will not be replicated back to Source by a Mirror profile).
It may safely Fail (without doing anything else) in either the presence-check or the scan if Windows tells us that there is no drive present.
However, if the device is declared by Windows as being "present, working, but no files" would such a situation cause a problem, although the Warn/Percentage trap will probably catch it if it tries to delete off everything.
Note that this scenario is also applicable in situations where your Drive F (backup) becomes faulty the same way, in which case, the data in Drive J (source) could be potentially be deleted. (Same warn/percentage trap applies if enabled).
It may be better for you if you switch to using a Mirror profile instead (if the backup drive is reported as ‘no files’ by mistake, those 'absence' will not be replicated back to Source by a Mirror profile).