The past couple of years has forced me to rethink many of my recommendations for how you backup computers in small office and home environments. Previously, I would have said that you could use a disk attached to an Apple AirPort. But the AirPort Base Station is no longer being made. Previously, I would have said you could use Time Machine Server, a service built into macOS Server in 5.4 and below. But that service is no longer being made in macOS Server by Apple and is now found in the Sharing System Preference pane . Previously, I might have even said to use the home edition of CrashPlan, which…