Why is my iPhone' system data taking up 31.34 GB of my storage?

Hello!

Other System Data include caches, logs and other resources currently in use by the system. Cached files can come from streaming music, videos, and viewing photos.

You can learn more about Cached files and how to optimize your storage: How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

cornandgoats Said:

"storage: why is system data taking up 31.34 GB of my storage"

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About "System Data":

System Data (formerly called "Other"), basically contains unnecessary files such as caches that are used for system ease of use - all of which gather over time. Caches would be being used for remembrance of application use. Use my User Tip: How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip.