Making backups of your Mac library are among the most popular questions for Mac 911. It's not enough for many to have a backup created by Time Machine; Many of you will also have a manually created backup that is more accessible if something goes wrong. The capture to manually back up a photo library is to use a method that is not boring.
The answer may be with synchronization software. Synchronization software allows you to keep files and folders in two places (or more) updated with each other. The synchronization software has existed since Mac's earliest days and I have used many synchronization programs.
My current favorite synchronization application is ChronoSync. It's a kind of kitchen sink program: it can do anything you can plausibly do to keep things synchronized, cloned, backed up, archived, anyway. It requires a small study to master, but it is worth it.
How to use ChronoSync to back up your photo library
Start by just copying the image library of the external hard drive or storage device you want to use. (Your photo library is located on the Mac's primary storage device, in a folder called Images.) The library is processed by macOS as a package that it can copy without problems. Then you can set up a synchronization task in ChronoSync.
In ChronoSync, select the primary image library of the main storage device as source-shaped. Then select the library you copied to the remote drive as your destination. And that's about it. Save the task and run it whenever you want. ChronoSync will ensure that any changes to your primary library are reflected in the backup.
You can also schedule tasks in ChronoSync and use to install a volume as a trigger. When you take the volume back from the offsite to update it, connect it to Mac and the synchronization operations start.
You can keep a perfect cloned backup, but you can also use the archival options. By synchronizing deletions and archiving replaced files both the tag, the destination copy of Photos Library will always resemble your live version. However, all files that have been deleted or updated have their original versions stored in an archive catalog for later retrieval.
This Mac 911 article answers a question from the Macworld browser Robb.
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