If you’re stuck with Access you’ll need a process that can run on the machine hosting access and push data to NetSuite via RESTlet or web services. If you can sync your access data to a web-accessible SQL server (MS SQL, MySQL, etc.) then you can use something like Celigo Integrator IO to push the data to NetSuite. If you can tolerate some degree of manual processing, you can export your Access data to CSV and then perform CSV imports into NetSuite, or once again use a Data Loader with Celigo Integrator IO if you need a rich toolset to handle mapping and transformation.