Installation and Patches produced by Windows Installer will keep a backup in %SystemRoot%\Installer folder for the future operation such as configuration, uninstallation and so on. This is a very good thing, but if the installation is canceled or failed, Windows Installer will not delete the MSP or MSI file before it quit. When user run the installation again, a new MSP or MSI file will copy into the %SystemRoot%\Installer folder with a new name and the previous MSP or MSI file will be useless.There are other solutions of similar algorithm on network. If you are using the 64-bit operating system, please be sure to confirm whether these solutions support 64-bit operating system. A program does not support 64-bit operating system may delete your useful backup file in error.Manual

Compare Folder It compares files, folders and sub-folders (if desired) to quickly update backup set before you get down to some serious work.It can easily sync the files to ensure a perfect match. This comparison utility will compare and verify your files based on your choice of Data, Size, Timestamp and Place.Compare Folder synchronize your files between PCs, backups or any removable media such as CD RW, ZIP, JAZ, FLASH drives etc. Compare Folder will list you the changes between two media, presenting you the Missing files, those that are Newer and those that are Duplicate from both media selected. You can select which files to copy over to the other media, or copy them all in one go. Compare Folder let you select how files are compared, and where to look for files. Scan Sub folders let you scan for files not only in the selected folder, but including all of its sub folders. This is very important to synchronize or backup an entire folder, or drive. Include is Presets for fast synchronization of multiple source and destination. The newest stable version is 3.3.