Previous Version File Backup
If a new version of the Macro Toolworks is installed then the macro files created in previous version are backed up when they are open in new version. The backup file is located in the same folder as the original file and its name has "_backup_of_verXXX" suffix (for example, "MyMacros_backup_of_ver862.4tw).
Previous Save File Backup
When macro file is saved then the current macro file is backed up before the new content is actually saved. So there are two latest versions of the macro file always available. The previous version of the macro file has the same name and .4tw.pre_XXX extension (for example, MyMacros.4tw.pre_862). Both versions of the file are located in the same folder.