Apps with 'File Versioning' feature
The simplest way to keep notes.
FreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of all your important files.
A desktop personal wiki with inline preview as-you-type and lots of plugins.
Duplicati is a backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008.
A powerful Mac and Windows client for Mercurial and Git distributed version control systems.
SpiderOak provides an easy, secure and consolidated online backup, storage, access, sharing & sync tool for Windows, Mac OS X, and Linux (Ubuntu, Debian & Fedora).
Seafile is a professional open source cloud storage platform for organizations. It has complete file syncing and sharing features, reliable file storage and advanced privacy protection feature.
Windows desktop application to stay on top of your daily tasks.
Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.
Automatic Data Loss Protection for Your Small Business$10 USD per month per computer.
Tresorit is the end-to-end encrypted file sync and sharing solution which safeguards confidential information by design.
Sync makes it easy to store, share and access your files from everywhere - your privacy guaranteed. Get 5GB free or 500GB Pro account for $49/yr.
Private File Sharing, Sync and Mobile Access for Home and Business. Access, Sync and Share ALL docs, photos, music and videos from anywhere. No Storage Limits. No Security Worries.
Carbon Copy Cloner (CCC) features an interface designed to make the cloning and backup procedure very intuitive.