VLISP supports the automatic creation of backup copies of files loaded by the text editor. The actual backup creation occurs when you save the file for the first time. Backup files have the same name as your original file, except the file extension begins with an underscore (_) and is followed by the first two characters of the original extension. For example, the backup file for drawline.lsp would be drawline._ls.
Environment Options General Options. Choose the Editor option labeled Backup the File Edited on First Save to turn on automatic backup. By default, this option is already selected when you first install VLISP.Automatic creation of backup files is an option you can set by choosing Tools