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I am trying to sync LARGE folder from a Windows Machine to any other device (at the moment a Raspberry Pi with a USB Drive, but if I get this working it will be any other device). Large is just shy of 3TB. My thinking was that while I have access to USB I could pre-sync the folder by simply copying files over and then running BTSync to mirror any additional changes. Sync of course wanted to overwrite every file on the Pi. I am assuming due to changes in the file attributes triggering sync to replace them. Trying to use Sync across the lan will take roughly a Month and is outside the bounds of my timeframe. My next try was to use a Robocopy /copyall which in theory should make an exact duplicate of the file including attributes (created/modified timestamps etc). Still wants to overwrite the entire contents of the drive. I am a little stumped, and hopefully there is a way to achieve this? I really like Sync and dont want to have to resort to rsync and chron to automate mirroring my drive. tl:dr How do you manually copy files from a source directory to a target directory and then have Sync maintain them as mirrored without overwriting every file in the target. PS: Apologies if this is a trivial question. I'm new to sync, and spent most of yesterday on Google, and these Forums trying to figure this out.