Update: iOS 11 is out now! It's 1.7GB in size, so if you're concerned at all about space, you may want to follow these tips to make some room on your iOS device.
Computers used to be all about expandability. Essentially you owned a box that could be tailored to your needs as your requirements evolved. A popular upgrade path was storage, adding new hard drives as your files grew in size and number. But with Apple's touchscreen revolution, everything changed.
The iPhone, iPad and iPod touch are more like appliances than 'traditional' computers - they're sealed boxes that forever remain as they were the moment you purchased them. You can no more extend their storage capabilities than you can add a new compartment to your fridge-freezer.
A quick look at Apple's modern hardware suggests its entire line-up is heading in the same direction, but iOS devices are more restricted than Apple's desktops and notebooks. After all, if you need more storage for a MacBook Air, you at least have the option of offloading large documents to an external hard drive (and, of course, then sensibly backing up that data along with the internal drive's, either locally or to an online service such as CrashPlan).
But iOS devices aren't designed that way. They don't have a USB port or a user-accessible file structure. The intention is that you store everything on the device itself (well, almost everything - services like iTunes Match enable you to grab your music from the cloud).
Therefore, an important tip when it comes to better iOS device storage and management comes at the moment of purchase: buy the model with the most storage that you can afford, unless you're absolutely convinced you won't need it.
Even then, reconsider; be mindful that as technology evolves, demands for storage increase. Retina screens require larger applications, and iOS cameras can shoot HD video, which requires a huge amount of space.
Also, demands on iOS devices are increasing purely on the basis of what they can now do. People frequently shoot and edit video, work with photography, read magazines and compose music on iPads and iPhones. All these things require lots of storage.
If your device gets really full, it alerts you. Also, things stop working. You won't be able to install new apps or shoot video new footage. You may find that updating apps becomes problematic, because the device doesn't have enough space to download, unpack and install updates before deleting older versions.
We offer advice for dealing with such a situation, along with managing iOS storage in general. Note that this isn't intended as a start-to-finish walkthrough, more a series of ideas that can be utilised to free up space.
As ever, we should stress the importance of back-ups before making major changes to iOS devices. Even if you're backing up to iCloud, make the occasional local back-up (select your device in iTunes and click 'Back Up Now' on the Summary page).
Local backups are also useful when it comes to dealing with app data, because you can later use iExplorer to fish out settings and other documents from such a backup, even if those things have long been removed from your device. Also ensure before making any major changes in terms of deleting content that you don't only have said content on your iOS device.
For music, sync your device with iTunes to transfer tracks to your Mac (although you can grab previous purchases from iTunes, if necessary). For photos and movies, transfer them across by attaching your device to your Mac via USB, launching iPhoto, selecting the device and clicking the Import button.
How to manage iOS device storage
1. Check device capacity in iTunes
Although iOS devices no longer require iTunes, Apple's desktop app remains useful from a device management standpoint. Connect your device (via USB or over Wi-Fi) and select it from the Devices button. Across the bottom of the window, you see a chart detailing what's taking up room: audio, photos, apps, books and 'other'.
If storage is an issue, you could free some up. For example, if you've lots of music or photos on your device, select the relevant tab, uncheck the sync box and then sync your device. The relevant media is removed. You can then perform updates and manage your apps, perhaps free up more space, and later restore your media by resyncing it.
Occasionally, you might find the 'other' section becomes massive. In our experience, this is usually down to you having a lot of in-app data (see Step 3) or failed app updates, which can happen on trying to update without enough free space. Resyncing should help; if not, a restore from a local backup.
2. Discover app sizes
Apps can be massive. Sizes are shown in iTunes and the App Store, but that's the size of the compressed download. Once installed, an app's size can balloon.
In iTunes, check app sizes by clicking on the Apps tab and selecting Sort by Size from the pop-up menu at the top of the apps list. Peruse the list, and if there are apps or games you no longer use, consider deleting them. You can do so by clicking Remove in iTunes; when you've done so for all apps you'd like to delete, click Sync.
Alternatively, tap-hold an app on your device to make all the icons jiggle and, for each, tap the cross icon and then 'Delete' to remove it.
3. Examine app data
Open the Settings app on your device and in the General category, select Usage. You see available and used storage and a list of apps. These are ordered by the total amount of space they require, including app data.
Newsstand and similar apps tend to be storage-hungry. Their containers might be small, but the actual magazines rarely are. If you want to see how much space an app's data is using, tap the app in the list and look at the Documents & Data figure.
If you've several such apps taking up loads of room you need, consider deleting data. For example, if you subscribe to magazines, delete old issues from within each app. You can usually redownload issues later if you need to. If you fancy taking a speedy option and don't have a capped broadband connection, deleting a Newsstand app takes all its data with it. You can then download a fresh copy from the App Store and the latest issue.
Magazine and book apps aren't the only storage culprits, note. Dropbox can (optionally) store documents locally (by flagging them as favourites) and some video apps have download capability, so check those too.
4. Back-up app content
Should you no longer use a game or creative app, but think you might one day return to it, download its data to your Mac using the free version of iExplorer (http://ift.tt/1vFvq0k).
Connect your device to your Mac via USB, select Apps from iExplorer's sidebar and select the app in question. Select the Documents and Library folders, Ctrl-click and select Export to Folder. (Alternatively drag them to a Finder folder.)
The contents of these folders can later be sideloaded into a fresh install of the app, meaning you won't lose your progress in a game that doesn't support iCloud, or could get saved compositions from a music-app back to your device with a minimum of fuss.
5. Use last-chance folders
If you tend to frequently download new apps, chances are some fall out of favour, but you might not necessarily know which. Create date-based folders (07-2013, say) and place apps within that you don't think you use any more. If you find yourself using one, 'rescue' it from the folder. Otherwise, delete the folder's contents after a few months, first backing up app data as necessary.
(Note: if you don't download apps to iTunes on your Mac, sync with it before deleting the apps, so you've a back-up you can later install to your device. You can of course redownload apps from the App Store, but only if they are still made available to you.)
This is a fairly ruthless app-management method, but it's useful for keeping installs current and ensuring you have space.
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