Backups of Advant AC450 / AC410
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With the Duap command you create a "image" of the memory. This is enough for the most scenarios. But if you have fatal errors in controller or your user disk is demaged the last way to restore all is to load the source code.
Thats why I recommend from time to time to make source code dumps with DUDBS and DUPCS. You also need this source code files to transfer your database and programs to the Control Builder.