You probably have gigabytes of wasted space in your iTunes library, and you don't even know it. Here's how to reclaim some of it
If you routinely download apps through iTunes, think twice about what you're doing. You probably have wasted a lot more space than you need to. Here's how to get some of that space back, and why it disappeared to begin with.
For me, it was just a bad habit that I started when I first started downloading apps from the App Store, years ago. I used to browse the App Store on my Mac through iTunes, then I'd download apps that I thought looked interesting, syncing my iPhone or iPod touch (and later the iPad) when the mood struck me.
For years it wasn't a problem - I had a large hard disk drive, storage wasn't an issue. What's more, my Mac was the hub of our household Home Sharing network, so my wife and kids would often copy new downloads from my iTunes library rather than having to retrieve a copy from the App Store themselves.
The fact is, though, Apple keeps track of what you download from the App Store. You can redownload those apps on any authorized device.
As a result, my Mac contained literally gigabytes of downloads I no longer needed - because those apps are available, whenever I need them, on demand through the App Store.
When I switched over to a Retina MacBook Pro, I suddenly found storage space at a premium - I had only a fraction available of what I had previously. At that point it made sense to delete the lion's share of the apps I'd downloaded. Many of those apps, large games especially, occupied hundreds of megabytes or a gigabyte or more. The net result is that I got literally dozens of GB back on my hard drive after I was done.
To delete apps you don't need anymore:
Now, there are a few caveats. If you're a tightly metered Internet service, you may run into trouble if you have to download the same app onto multiple devices, because you're downloading the same data over the Internet multiple times.
What's more, if you're concerned about keeping an app that's been pulled from circulation - as some have, for various reasons - it may be wise to keep a local copy handy that you can restore if you need to.
You can also save space by deleting unneeded iOS device backups that iTunes has created. To do so:
How do you know if a backup is unnecessary? Some backups may have been sitting around for a long time. Take this one, for example. It's from when I last backed up my iPhone 5, the night before I bought my iPhone 5s.
I don't need that file any more. And as it turns out, I just got 1.8 GB of hard drive space by deleting it.
Tomorrow I'll talk about what happens when you have to sync a device that contains apps you've deleted from your iTunes library.
If you're like me and a constant grazer on the App Store, you can get back tons of hard drive space this way. Give it a try and tell me what you think in the comments!