Use the Create File List task. In that task, capture the number of files found.
Do this for each server. If the count is greater than zero, then proceed with your project.
The Create File List Task will create a File List Variable based on the filters specified in the File Set. This variable will contain the file paths of the files found. That variable can then be used in other tasks by specifying that name in the Input Files Variable attribute. The Number of Files Found Variable will contain a count of the files, which is useful in other tasks by using the Execute Only If condition and checking to see if the number of files found is greater than zero.