Backing up Windows “Users” folders with Syncthing

With CrashPlan getting out of the home backup business, I found myself shopping for a new backup solution.  As replacements, CrashPlan was pushing either Carbonite or their own plan for small businesses… but either of those would have at least doubled the cost of backup.  Thus, I started to look at setting up a remote Raspberry Pi backup server myself.  A friend pointed me to BitTorrent Sync (now called Resilio Sync) which, in turn, led me to their open-source competitor, Syncthing.  Two things ultimately led me to choose Syncthing over Resilio: (1) open-source review of their security, and (2) a post by Jaime Jiménez, Running Syncthing or Resilio on a Raspberry Pi 3.  Also, as just a bonus, Synthing offered a more supported solution to also backup my legacy Windows XP gaming machine (something CrashPlan stopped allowing a couple years ago, and Resilio has outdated support for [but still currently possible]).