How to back up an iPhone to iCloud, your computer, or an external hard drive

You can back up your iPhone's data wirelessly with iCloud, but you can only save a limited amount of data for free.
If you have a PC, you can back up your iPhone with iTunes; if you have a Mac, you can use Finder.
Once you've saved a backup to your computer, you can also move it onto an external hard drive.
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When was the last time you backed up your iPhone? Hopefully it wasn't too long ago — otherwise, you're one accident away from l