There are downsides to adding features in layers, as opposed to integrating them with the FS, but dm can do quite a lot: https://docs.kernel.org/admin-guide/de

There are downsides to adding features in layers, as opposed to integrating them with the FS, but dm can do quite a lot: https://docs.kernel.org/admin-guide/device-mapper/snapshot.html https://docs.kernel.org/admin-guide/device-mapper/snapshot.h...