This is part 16 in the series of “Beyond the good ol’ LaunchAgents”, where I try to collect various persistence techniques for macOS. For more background check the introduction. Screen savers have been detailed recently by Leo Pitton his blog post: “Saving Your Access”. Considering that he already wrote most of the interesting stuff, I will try to show some new information, but there will be some overlap. Screen savers are macOS bundles with the bundle extension of .