If I have a PC that has all the OneDrive content synced (especially Documents and Pictures), and I want to have the same files available (with or without taking space on that PC), to another PC(s) the sync should occur through my local LAN, not over the internet connection. This will save Megabytes or Gigabytes of WAN traffic, thus decreasing the time required to sync, plus also make files available to devices that may normally need to sync through a metered connection.