Now, I may not be the perfect user for this feature, but I wanted to give it to try. And I definitely saw it in action, but I can’t call it a success. It was, in fact, the single most frustrating moment I spent with macOS Sierra.
Here’s what happened: I was editing a podcast in Apple’s Logic Pro X, and my project was stored on the Desktop. All of a sudden, the voice of one of my podcast panelists simply vanished from the mix. I quit and re-launched Logic, only to be told that the file in question was missing. Sure enough, a visit to Finder revealed that Sierra had “optimized” my storage and removed that file from my local drive. I’ll grant you, the file was a couple of weeks old, and very large as most audio files are. But I was also actively using it within a Logic project. Apparently that didn’t count for anything?
So that’s bad. That’s enough for me to turn off that feature and never use it again—or at the very least, never keep my project files on the Desktop or in the Documents folder.
To add insult to injury, at the time my files were deleted, my hard drive had approximately 80GB of free space. Why were the files deleted? I have no idea, but I suspect a bug in how Sierra was viewing the stock internal SSD of my iMac, because it’s also warned me that it didn’t have enough space to back up a 64GB iPhone with more than 100GB free, and gave me a “you’re about to run out of disk space” warning with 60GB free. So not only did Sierra remove files that I was using, it did so without any necessity.
At this point I downloaded all my files from iCloud, copied them to a file server just in case, and turned off both the Manage Storage feature and iCloud syncing of my Documents and Desktop folder. It’s a nice idea, but I’m not willing to have the place on my Mac where I keep key projects and documents to be a place I can’t count on. Think twice before enabling this feature.
I use BitTorrent Sync Pro to synchronise my Desktop and Downloads folders between my Macs. I can’t see myself moving away from this solution in the near future and switching to iCloud.