The Windows BCD store for the utility VM is mutated during layer import, which causes failures in docker save. Back up the BCD store and related log files so that save has access to their original contents. Fixes #25893. Signed-off-by: John Starks <jostarks@microsoft.com> Upstream-commit: 9c79b0efc02c6452cb9521faa466dcc118a0e433 Component: engine