Yes, the sender will only buffer data based on the amount of space on the local hard drive. The sender service will send an email notification at 1000MB if configured correctly. By default when the space left hits 100MB on the machine it will begin to throw out data. We highly recommend setting up the datasets to email if not receiving values. Each dataset should record from a single source. This can notify the user of a buffer that can then be addressed before using up the space on the machine and prevent data loss.