Lethe is described as 'Deep Freeze -like partition freezing software for Debian GNU/Linux and Lihuen GNU/Linux (May work on other Debian-based GNU/Linux distributions)' and is a System Restore Tool in the Backup & Sync category. There are more than 10 alternatives to Lethe for Windows, Mac, Linux and Android. The best alternative is Time Machine, which is free. Other great apps like Lethe are Deep Freeze (Paid), Duplicacy (Freemium, Open Source), Shadow Defender (Paid) and Reboot Restore Rx (Freemium).
Time Machine is the breakthrough automatic backup that’s built right into Mac OS X. It keeps an up-to-date copy of everything on your Mac — digital photos, music, movies, TV shows, and documents. Now, if you ever have the need, you can easily go back in time to recover anything.
Deep Freeze Reboot Restore Software prevents any changes made on your system making PCs indestructible. Reboot Restore software is a comprehensive Windows System Restore solution that empower end users with each reboot.
Reboot Restore Rx makes it easy to maintain PC’s in small public access computing environments (classrooms, computer labs, kiosks, internet cafes, libraries, etc.). Every time you restart the PCs they will automatically reset to your predefined baseline setting.
Most users think Reboot Restore Rx is a great alternative to Lethe.
Toolwiz Time Freeze is an effective Instant System Restore software to keep your computer system safe and protect your computer from undesired changes. It can also protect your files and folders from changes with a secure password protection.
Nero BackItUp protects your files and memories on your PC or laptop. Have your filed automatically backed up on up to 3 locations, such as USB hard disks. All you need to do is click one button to set up your backup.
SmartShield allows administrators to ensure the ongoing integrity of their workstations without limiting usability. With SmartShield Protection enabled, all changes made to a workstation are removed with every restart. This makes unwanted system changes an impossibility.
Dafturn Ofris, Freeze from Indonesia, is an open source application that can freeze your Linux, like Deep Freeze in Microsoft Windows operating system. So, you can lock your system by using this application.