All Mac users need a complete backup system, in whatever combination of external disk drive cloning, Time Machine backups, or anything else that duplicates the files and folders most valuable to you.
Why would anyone need to sync files in one direction only? That’s what OneWaySync does and it’s perfect for Mac users who need to travel with the same files stored on a desktop Mac, or a Mac user who needs to ensure there are copies of valuable files stored elsewhere.
That’s what OneWaySync does. And not much more.
What you get is an elegant and straightforward backup system, sync if that’s what you want, which simply mirrors the files from one folder to another folder, but in one direction only (although, to be fair, you can get bi-directional synchronization simply by changing the direction).
OneWaySync uses the time honored and convenient Source and Destination interface. Select the Source folder of files you want to sync, then select the Destination folder, then click the big Start button. That’s it.
As simple as that method is for creating a duplicate folder on another Mac or an external disk, OneWaySync comes with plenty of useful features, including options to create 14 pre-configured backups, copy all photos and videos from iPhoto or Photos, make faster syncs by copying only files which have changed, and options to delete files in the Destination which have been deleted in the Source folder.
My favorite feature, though, is the Scheduler and the built-in option to run multiple sync configurations at the same time, though that takes a few more steps and requires some understanding of AppleScript and use of Calendar.
OneWaySync can record every file copy using the built-in logging system, and there is another option to toggle copying hidden files. It also makes it easier to create backups of iPhoto (and Photos) from the Pictures folder, and iTunes from the Music folder.
For Mac users on a tight budget OneWaySync provides a very good way to copy and keep synchronized folders from your Mac to 1) another Mac, or 2) an external disk drive, and is priced more as a bargain than anything.