Thanks Helen, Yes, Basically all synced folders needed to redownload all the content, all one way. With Full access secret key. All files are very static files, and are not accessed by anything else than FreeNAS system and Sync. NAS version: 9.2.1.6 - I upgraded yesterday night to 9.2.1.7 And Sync refused to start after reboot: error 502. After multiple reboots, I had to de-install sync, reinstall the latest build of Sync (in a new Jail). Delete the previous Jail, Recreate new folder with the console (FreeNAS bug), recreate jail to storage mapping. Now I need to reassign the keys to folders in the Sync WebUI, and pray for the best. I'll let you know. Thanks again!