Will Classic Folders Stay Forever? in Sync General Discussion Posted August 1, 2015 · Report reply At the moment, i use sync mainly as a online backup for some of my customers and my own devices (IT-Service). Classic folders, read-only mode.Server does another backup of the synced folders and customers have ftp-access to the folder on the server. (Only testing at the moment, especially syncing very large files (acronis true image) is a litte bit difficult) I use classic folders because the setup is easier. I can move or reinstall the server without work on the client side.