I run macOS Sierra on a MacBook Pro and iMac. Latest version of NC, on its own dedicated server latest versions of the Desktop Sync client.
When I try and sync the folder using the NC apps, 12GB apparently will take 5 days!!! the connection is 50MB/s down and 10MB/s up! - Server is on a 1GB/s Datacenter connection and is SSL certified via Lets Encrypt
I’m also having a problem with Sync not automatically keeping files up to date - the only way I can keep it current is by quitting the NC client and restarting it