NovaBackup Software - NovaBackup Software is a cloud-based backup software that is intended for the windows system, allowing you to store your files, documents, and much more.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Mozy home - Mozy home is one of the effective and secure online Backups that allows you to keep your documents saved all the time, even there is a disaster with the system.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Google Drive - Access and sync your files anywhere
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.