I’m sure this sounds familiar: You’re trying to install the latest iOS release, upgrade to a new iPhone, take photos or record video, or just download that cool app everyone’s talking about, and your iPhone says the storage is full.
You’ve already deleted every app you don’t think you need, and there’s still not enough space on your iPhone. So you open Settings, tap General, then iPhone Storage, and, sure enough, your iPhone is full. Worst of all, a huge chunk of it is just listed as Other (renamed System Data in iOS 15). What’s that supposed to mean? How do you get rid of it? The Other/System Data storage sections are mysterious and confusing, and there’s no one answer that works for everyone, but hopefully, this guide will help you deal with this problem.
Latest iPhone release: iPhone SE (March 2022), iPhone 14, iPhone 14 Pro, iPhone 14 Pro Max (September 2022); iPhone 14 Plus (October 2022)
Latest iOS release: iOS 16.5.1 (June 2023)
Latest iOS beta: iOS 16.6 (June 2023)
How to view your iPhone storage
To see how much storage all your apps and data are taking up on your iPhone’s storage, open the Settings app, select General, then iPhone Storage. At the top, you’ll see a bar graph showing your total iPhone storage and which types of data are filling it up. Beneath that you’ll find a list of applications on your phone and how much room they take up, both for the app itself and its stored data.
It may take several seconds for your iPhone to show the graph, as it takes time to scan and analyze its storage. Even after the chart first appears, you’ll want to wait several seconds more for it to stabilize, as the app list and storage sizes can change while your phone completes its analysis.
You’ll find your iPhone storage details a few layers deep in the Settings app.
What is System Data (or Other storage) on iPhone?
Your iPhone Storage menu will divide that bar up top into familiar categories like Apps, Media, Photos, and Mail, but also an Other/System Data category that is sometimes very large. It’s common for System Data to be in the 5GB to 20GB range, but if it’s way over 20GB, it has probably grown out of control. You can scroll all the way down to the bottom of the app list where you will see iOS, which are the files required by the system and are usually around 10GB, and System Data, which are files other than apps and downloads that are collected by iOS. Tap on System Data to see how much space it is taking up.
The Other/System Data category is big and varied because it’s a real catch-all category. It’s comprised of system caches, logs, Siri voices (if you’ve downloaded more than one), updates, and so much more. One of the biggest culprits for Other/System Data growing out of hand is streaming lots of music and video. When you download video or music from the iTunes Store, TV app, or Music app, it’s indexed as Media. But streams have caches used to ensure smooth playback, and those are categorized as Other/System Data.
Safari’s caches can start to grow pretty large, too. And if you send tons of texts with images or video, the caches for that can start to fill up a lot of space. Your iPhone is supposed to manage these caches to keep your storage from becoming completely full, but it doesn’t always do a great job.
Clearing your Safari data might reduce the size of Other.
We discuss how to delete Other storage on a Mac and how to delete System Data on a Mac separate articles.
How to reduce the size of Other/System Data on an iPhone
You can’t get rid of Other/System Data entirely, but you can sometimes reduce its size.
First, let’s try clearing your Safari caches. Open Settings> Safari and choose Clear History and Website Data. If you have a lot of Safari tabs open on your iPhone, you might want to close most of them, too.
You might also want to change Messages to save fewer old messages. Open Settings, then Messages, and scroll down to the Message History setting. By default, Keep Messages is set to Forever, but you may want to change it to 1 Year or even 30 Days to reduce the data that the Messages app caches. Just beware that doing this will mean old messages will be deleted–so if you have any messages you want to keep find a way to back them up.
If you’re a heavy texter, your Messages app might be filling up your storage with a lot of data.
Finally, go back to iPhone Storage and look at the apps list. Most of the apps store data that is categorized as Apps, but some will keep caches that are categorized as Other/System Data. If, say, the Podcasts app is taking up a couple of gigabytes of space, it’s likely mostly cached data. Deleting the app and re-downloading it might put a dent in the Other/System Data category.
The nuclear option: Backup and Reset your iPhone
You can go through your iPhone trying to delete every little cache that could grow the size of Other/System Data storage, but if you really want to make it as small as possible, you need to back up your phone and reset it. This can take a little while. The best way to do this is to use your Mac or PC.
On a Mac running macOS 10.15 Catalina or later:
First, connect your iPhone to your Mac with the bundled USB-C-to-Lightning cable.
When prompted on your iPhone, tap “Trust” and enter your passcode.
In the Finder sidebar on your Mac, select your iPhone under Locations.
Click the General tab.
Select “Back up all of the data on your iPhone to this Mac.”
To encrypt your backup data and protect it with a password, check the “Encrypt local backup” box.
Click Back Up Now.
Note: You can also connect your iPhone to your computer wirelessly if you set up syncing over Wi-Fi.
Foundry
On a Mac running macOS 10.14 Mojave or earlier, or a PC
On a PC or a Mac with macOS 10.14 or earlier you can use iTunes to back up your phone. After you connect your iPhone to your Mac or PC, select your iPhone by clicking the little phone icon in the upper left, and under Backups, choose “This Computer” and check the “Encrypt local backup” box to protect your backup with a password. Then click the button to Back up now.
Reset and restore
When the backup is done, disconnect your iPhone and head to Settings> General> Reset, and select Erase All Content and Settings. This will return your iPhone to an out-of-the-box state. When it restarts and it’s in the initial setup process, re-connect it to your computer with iTunes open, and follow the instructions on the screen to restore your device.
This is the longest and most involved way to reduce the size of Other/System Data storage, but it’s also the best. There’s just no way to get it any smaller than it will be after a fresh reset and restore.
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