Hardware needed to run the following PHP/MySQL/Linux System
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I developed a system to work with patients and stuff related to medical things.

In this case, the system has a MySQL database with 14 tables.

The table for doctor's appointments is going to record 50 appointments everyday. Then, the table for patient's record is gonna record 2000 entries every month. 

There's also a message system, an agenda and some other little things. The system is gonna have, a very few users, like 15 or 20 everyday using it.

The company has a Dual Core AMD of almost 2.0 ghz with 4 GB RAM and 250 GB disk. ¿ Do you think is this hardware configuration enough ?. Or what is the recommended hardware for you point of view?.

The system is gonna run under Debian Linux.

Thanks.