Initial sync with data already present on both sides

[tenox (Antoni Sawicki)]

I’ve got it resolved in this post:

what is the procedure of enabling sync of folders that are already "in sync" outside of syncthing

I have a hard disk with data. I made a clone of it and shipped to another location via FedEx. What are the steps required for me to enable ongoing syncing, without copying existing pre-synchronized data over network? Do I add it as a folder on one machine, wait for scan to complete, share with another machine and select the right disk on the other? Thanks!

the trick is to add both sides with same folder-id but do not share until initial scan is complete.

Thanks all for help!