HP Officejet J3680 All-in-One Printer - Manual (Page 61)

The following Backup Fax Reception modes are available:
On The default setting. When Backup Fax Reception is On, the device stores
all received faxes in memory. This enables you to reprint up to eight of the
most recently printed faxes if they are still saved in memory.
NOTE: When device memory is low, it overwrites the oldest, printed faxes
as it receives new faxes. If the memory becomes full of unprinted faxes, the
device stops answering incoming fax calls.
NOTE: If you receive a fax that is too large, such as a very detailed color
photo, it might not be stored in memory due to memory limitations.
On Error Only Causes the device to store faxes in memory only if an error condition exists
that prevents the device from printing the faxes (for example, if the device
runs out of paper). The device continues to store incoming faxes as long
as there is memory available. (If the memory becomes full, the device stops
answering incoming fax calls.) When the error condition is resolved, the
faxes stored in memory print automatically, and then they are deleted from
memory.
Off Faxes are never stored in memory. For example, you might want to turn off
Backup Fax Reception for security purposes. If an error condition occurs
that prevents the device from printing (for example, the device runs out of
paper), the device stops answering incoming fax calls.
NOTE: If Backup Fax Reception is enabled and you turn off the device, all faxes
stored in memory are deleted, including any unprinted faxes that you might have
received while the device was in an error condition. You must contact the senders to
ask them to resend any unprinted faxes. For a list of the faxes you have received,
print the Fax Log. The Fax Log is not deleted when the device is turned off.
To set backup fax reception from the control panel
1. Press Setup.
2. Select Advance Fax Setup, and then select Backup Fax Reception.
3. Press the right arrow button to select On, On Error Only, or Off.
4. Press OK.
Reprint received faxes from memory
If you set the Backup Fax Reception mode to On, the received faxes are stored in
memory, whether the device has an error condition or not.
NOTE: After the memory becomes full, the oldest, printed faxes are overwritten as
new faxes are received. If all the stored faxes are unprinted, the device does not
receive any fax calls until you print or delete the faxes from memory. You might also
want to delete the faxes in memory for security or privacy purposes.
Receive a fax 57