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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.

i have a lot of files that are already at the BackupLocation and i want to add it as ReadOnly. But unfortunately it will not recognize them and resync all of them as i have just tested (both with v1.4.7.2) My Steps: created 2 Folders on each PC with identical files PC\1TEST-RO PC\1TEST-RW PC\2TEST-RO PC\2TEST-RW added both on PC1, closed BTSync on PC1 started BTSync on PC2 and added the ReadOnly Key for TEST-RO and ReadWrite Key for TEST-RW TEST-RW gets indexed but TEST-RO does not seconds after i start BTSync on PC1 TEST-RW is done, but TEST-RO is doing a full-pull from PC1 to PC2 would be great to enable the PreCopy also for RO Syncs. Thanks for any help and gerally for this great tool! Ragnar