Access Control Project (Help)

I had an idea for an access control system based on my Arduino. I would like the system to have a private web site where I can add users and set permissions for them. The lock would be based off an RFID reader and also an electronic door strike. I currently own an Arduino Uno R3 and an Arduino Mega2560. I also have an ethernet shield so it could communicate with the website. Lastly, I would want to be able to backup all the user data to a micro SD card on the Arduino Ethernet Shield in case of a power outage or other possible disasters that could occur.

If possible, please try to send some sort of schematic or tutorial and leave replies. I very much appreciate feedback from highly experienced Arduino hobbyists or anyone that has information that could help me accomplish this project.

Thanks and Have a merry Christmas and a happy New Year,

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