Sometimes we need to deal with a lot of documents, after a long time we don’t know which files should be backup , actually use WinRAR function can very easily backup files, and still can guarantee that is the latest! First of all files in the backup folder to squeeze in a backup. Rar file. Then you can open the WinRAR software and select your backup folder, click the “add” button in the toolbar, and note then select update mode to “add new update document”, so all files all in the backup folder join backup. Rar file, later as long as you do the same operation after work everyday, then just open the file, can ensure your file is the latest.