How can I sync iCloud Drive with another directory?

The iCloud Drive folder which you can access from the Finder downloads files on demand by default, i.e. not all files that you may want to sync are directly available for syncing.

If you try to sync a file that has not been downloaded locally, SyncTime triggers the download during the file copy phase. To ensure that all files are always downloaded locally and be able to sync them without delays, you can disable the option “Optimise Mac Storage” in the System Preferences, under Apple ID > iCloud.