.Library and .Trash are system directories inside your home directory. SyncTime doesn’t have enough privileges to access these directories and all files inside them. You can exclude these system directories with a File or directory or Hidden filter. If listed in the confirmation dialog, you can right-click them to open the context menu and select Add selected files to the…

In general, SyncTime should be compatible with Cryptomator. There is a Cryptomator issue that causes images in a vault in iCloud Drive to not be copied correctly, which I reported in January 2023: https://github.com/cryptomator/cryptomator/issues/2650

If you select the ~/Library/Mail directory as a source (where ~ represents your home directory), the sync should run without issues. On the other hand, selecting one of its ancestors, like ~/Library, can cause scan errors. In general, selecting a directory in an open panel grants an app access to all subfiles and subdirectories, but…

SyncTime syncs the source with the destination. It does not sync the source with the file inside the destination that has the same name as the source; doing so would make it less flexible as it wouldn’t allow to sync files with different names. When the source is a directory, you can easily create one…