With most of the structural applications, automatic backup files are created periodically and they can easily be restored should anything bad happen to your main file. Here’s a summary of how they work by programs.
Periodically the program makes a copy of the main file, filename.etz and saves it in the same folder with the file extension .bak. Just rename the file with a .etz extension and you can use it in the main program. The specialty design modules, like the Masonry Wall design module for example, also save backup files with the .bak extension.
RAM Connection stand alone uses the same scheme as RAM Elements. Backup files with the .bak extension can be renamed .cnx and used in the program.
RAM Structural system files are a little more complicated, because the main file with the .rss extension is literally a zipped set of files, but we follow the same protocol. A file with the extension .backup is created when the model is saved, so it always represents the model one-save-ago. Should anything happen to the .rss file, locate the .backup file in the same folder, rename is something.rss and then open that file in RAM Manager.
Ram Concept also creates automatic backup files but it maintains two levels of backups. You’ll find files with the extension .bak1 and .bak2 floating around with the main model. The .bak1 file is the most recent copy while the .bak2 file is slightly older. Either can be renamed with a .cpt extension and opened in the program.