I tried using Syncthing to backup my two kids Windows 10 laptops C:\Users\user folders to a home machine but found, it was always chewing CPU in bursts and making the fans whir.
I tried adding ignores for parts we didn't care about so much and fiddling with various settings, but it was still quite problematic.
Although I would prefer an open source solution, I'm looking at trying Resilio Sync next.
Windows 10 is constantly writing to the user profile directory, including the registry hives, temp/cache folders, and telemetry. Syncing the entire user profile directory turns into an never-ending battle of excludes for files, some of which exist only for seconds. Instead, only include the folders (Documents, Music, etc.) that you need to sync, and you will be much happier.
I tried adding ignores for parts we didn't care about so much and fiddling with various settings, but it was still quite problematic.
Although I would prefer an open source solution, I'm looking at trying Resilio Sync next.