Reboot Restore Rx - Reboot Restore Rx (freeware) prevents any and all changes made on your drive(s) making those PC's bulletproof and unbreakable.

Duplicacy - A new generation cross-platform cloud backup tool

Deep Freeze - DESCRIBING DEEPFREEZE SOFTWARE Deepfreeze, by Faronics, is an application that solves a unique problem that many companies have these days; it prevents an end user from making permanent changes to important system/administrative files.

Time Machine - Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.

Rollback Rx - RollBack Rx is an instant time machine for your PC. A Comprehensive Windows System Restore solution that empowers users and IT administrators to easily restore their PCs to any previous state within seconds!

Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.