HP 49g Graphing Calculator - Manual (Page 105)

Storing and deleting backup objects
There are three ways to create a backup object:
» Use File Manager to copy the object to a port. With this method, the
backup object has the same name as the original object.
® Use the STO command to copy the object to a port, and assign it a
name. See Coimnand Reference Part D for details of tire STO
command.
® Use the ARCHIVE command to create a backup of the HOME
directory, and assign a name to the backup object. See Command
Reference, Part B for details of the ARCHIVE command.
There are two ways to delete a backup object from a port:
® Use File Manager to delete the object as you would a normal calculator
object.
® Use the PURGE conuuand
- In RPN mode, use the following syntax:
:Port_Number: Backup_Name PURGE
- In algebraic mode, use the following syntax:
PURGE(:Port_Number: Backup_Name)
For example, to delete a backup object in port 1 named
“MYBACKUP”:
PURGE(:1: MYBACKUP)
You can restore a backup object by using File Manager to copy it to the
Home directory. When you restore a backup object, the HP 49G checks
the object’s integrity by calculating the CRC value and comparing it to the
one stored with the backup object. An error message appears if the data
has been corrupted.
Using data in backup objects
You cararot modify the contents of backup objects. You can, however, use
the contents in calculator operations. For example, if your backup object
contains a program, you can rim the program. If yoiu backup object
contains a value assigned to a variable, you can use the variable in
calculator operations.
To view a value saved in a backup object, or to rim a program stored in a
backup object, you can use File Manager as you would with a normal
object.
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