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…

Files extracted from an archive have particular permissions that prevent SyncTime from accessing them before the process has completed. Only when the process has completed SyncTime is able to access the extracted files without errors. There are some workarounds:

SyncTime itself does not use encryption, but you can encrypt the destination volume and protect it with a password. When connecting a password-protected volume, you’ll be asked by macOS to enter the password; you can also store the password in the keychain so that you don’t have to enter it every time when connecting it…

At the core, both apps create copies of your data. Time Machine is designed to create incremental backups of your Mac. SyncTime can do that too (although it’s not allowed to access some system files), but it can also synchronize files and allows you to customize various settings depending on your needs. Time Machine is…

By default, other users’ files cannot be accessed, not even by an administrator. To get access to other users’ files, you have to add explicit permissions.

SyncTime relies on the file copy mechanism provided by macOS, which returns an error if something goes wrong. If an error happens, SyncTime always displays it. If no error happens, with all probability the copy operation was successful and there’s no need to perform an immediate verification of the copied data. From time to time,…

Please see Sync confirmation dialog.

The default overwrite policy compares the modification date and size of a file to avoid comparing the actual file contents, which depending on the file size could take a long time. A checksum (or hash) is a short character sequence computed from a given input (e.g. a file). A checksum is, with high probability, unique…