Backing up the software and hardware configuration of an S7-300/400 CPU
If you have already downloaded a configuration to an S7-300/400 CPU, it is advisable to make a backup. You may have modified the configuration and want to test the new configuration. Before you download the new configuration to the CPU, you can create a backup of the current device state and then restore the current configuration at a later date. The backup is performed with the current values of the CPU. In the case of S7-400 CPUs with fail-safe function, the initial values are backed up.
You can create as many backups as you want and store a variety of configurations for a CPU. The backups are named with the name of the CPU and the time and date of the backup. You can find the backup in the project tree under the CPU in the "Online backups" folder.
The following figure shows an example of an S7 CPU for which two backups were created:
See also