ostree

libostree provides a library and tools for managing bootable, immutable, versioned filesystem trees. It is like git in that it checksums individual files and has a content-addressed object store; unlike git, it "checks out" the files using hardlinks into an immutable directory tree. This can be used to provide atomic upgrades with rollback, history and parallel-installation, particularly useful on "fixed purpose" systems such as embedded devices. This package contains the executables used to manage and create filesystem trees. It does not affect the boot process for the system on which it is installed.

sudo apt install ostree