Upload File to ArcGIS Server

Yes, its just as simple as that! While I see that GP services support 'Upload' I've yet to see an example where the user input is data local to their system. I just want to create a simply tool which copies a table from the user's local system and places it in a known location on the server. The service will then run another batch file/executable which takes the table as an input for another function.

Is there anyway to do this without needing to FTP the file up to the server?

EDIT: Clients are web-based, not desktop.