Validation is one of the WebOffice author key functions: You can only publish valid WebOffice 10.5 SP2 project configurations. Validation is done by WebOffice author automatically as soon as you want to save a WebOffice 10.5 SP2 project configuration. As long as WebOffice author finds one or multiple validation errors, the currently opened WebOffice 10.5 SP2 project configuration file gets stored to a back up copy (_BAK).
This is necessary to avoid overwriting of correct project configuration files by invalid configuration files which would cause errors in the WebOffice 10.5 SP2 clients.
Example for back up file name: If your original project configuration is WebOffice_SampleProject.xml then the backup file is WebOffice_SampleProject_BAK.xml. This file gets stored in the same directory (projects) where the original configuration file is stored.
Tip: You can use WebOffice author Delete function to clean up back up files not needed any more.

WebOffice author Save dialog - back up invalid configuration
You can always manually validate a WebOffice 10.5 SP2 project configuration by pressing the button Validate. If the validation is successful and did not return any errors then WebOffice author will display a notification in the status bar.

WebOffice author validation notification
Otherwise, if WebOffice author finds some validation errors, then these errors get listed in the Validation archive and WebOffice author will ask you whether you want to save the invalid configuration as a backup. The Validation archive is implemented as floating window to make step-by-step fixing of validation errors easy to handle.

Validation archive
Note: See chapter Validation Archive for details how to handle validation errors.