TimeShift is a system restore program for Linux, similar to Windows' Restore option or Apple's Time Machine for macOS. It creates incremental snapshots of the operating system and files, either manually or automatically at regular intervals. Therefore, if something stops working after an installation, configuration change, update, or other change, you can always revert to a previous state using these snapshots.
It has a simple graphical interface that allows for comfortable and intuitive work, enabling you to schedule snapshots, take them manually as mentioned, and restore to any of the defined points whenever you want to revert a change or return to a previous, functional version of the system. It's a great tool for managing and administering the GNU/Linux operating system that will save you from more than one problem. Therefore, it's a good idea to have it installed now to prevent future issues. For installation , you can use the package management tools included with your distribution and easily download and install the package and its dependencies, adding its repository, as it's not usually included in the official ones. Depending on the distribution, the process might vary slightly. Once installed, its GUI is easy to use, and it also offers a configuration wizard that allows you to configure how snapshots are captured.
Depending on your file system, you'll be able to work with different tools. For example, if you have btrfs, the TimeShift program might use features specifically implemented for this file system to create snapshots. For other file systems, it will use rsync. The snapshot will be saved where you specify, and to further refine the image creation, you can use filters and options to include or exclude certain files or directories from the system.