You can set to convert received documents into PDF format and save them to an external memory device connected to the printer.
Received documents are saved in the printer's memory temporarily before the documents are saved to the memory device connected to the printer. Because a memory full error disables sending and receiving faxes, keep the memory device connected to the printer. The number of documents that have temporarily saved in the printer's memory is displayed on
on the printer's control panel.
Select Settings on the printer's control panel.
To select an item, use the 
buttons, and then press the OK button.
Select General Settings > Fax Settings > Receive Settings > Fax Output Settings.
If a confirmation message is displayed, confirm it, and then tap OK.
Select Save to Memory Device.
Select Yes. To print the documents automatically while saving them in the memory device, select Yes and Print.
Check the message on the screen and then select Create.
A folder for saving received documents is created in the memory device.