This backup method is better than having nothing, but I do not regard it as a method providing a high level of safety, as it only preserves the last two versions of a project. If you click the Save button two times today you cannot go back to a version you worked on yesterday. I would like to suggest an alternative backup method that preserves all backup project files, maybe something like: MyProject.pte.bak_0001, MyProject.pte.bak_0002, MyProject.pte.bak_0003 ...