Snapshots on ZFS only take up space when files change. It's easy to use one of the many snapshot managers to accomplish what you want - I do it for my workstati

Snapshots on ZFS only take up space when files change. It's easy to use one of the many snapshot managers to accomplish what you want - I do it for my workstation and laptop. I have zero fear of deleting files, upgrading the OS, making sweeping changes to my system config, etc.