HP 48g Graphing Calculator - Manual (Page 391)

Using Backup Objects
The HP 48 uses a special object type, the backup object, to store
backup data. A backup object contains another object, its name, and
its checksum.
Backup objects can exist only in port memory:
■ Port 0.
■ Port 1 if it contains RAM cards set up as port memory (that is, not
merged). When you first install a card, it’s set up as port memory.
(Port 1 doesn't exist in the HP 48G.)
■ Ports 2 through 32 if they exist. (They don’t exist in the HP 48G).
1. Put the object on the stack.
2. Enter a backup tdenitfier for the backup object to create—see
below.
3. Press fsT^.
4. Optional: Purge the original object in user memory.
The STO command creates the backup copy using the port and name
specified by the backup identifier—it has the form
» portt name
where port is the port number (0 through 32), and name is the name
where the backup copy is stored. If you use port 1, it must not be
merged with user memory. The name of the backup object can be
different from the original name.
You can back up an entire directory (and its subdirectories) in one
backup object by putting the directory object on the stack and
making a backup copy.
28
Display the appropriate PORT menu, then press (r^ and the menu
key for the object,
or
Enter the backup identifier for the backup object and press
OdsD-
Libraries, Ports and Plug-In Cards 28-3