Backup Copy of Files  
If checked the program will create file backups adding tilde char into extension. If file has name MyFile.TXT, backup file will be MyFile.~TXT. Backup system works differently if backup directory option is used, see below.  

Folder for File Backup:  
If filled, file name is not changed, but file is copied into specific directory including original directory structure.  
original file: C:\Projects\Delphi\PSPad\PSPad.DPR  
backup directory: D:\Backups     
backup as: D:\Backups\Projects\Delphi\PSPad\PSPad.DPR  

Autosave [min]  
When set (ie value is not zero) then PSPad will automatically save changed files.