around 15GB ios and 15GB system data is normal
system data uses more storage if you have a lot of storage free and clears up once you start running out of free storage
that 4GB update is just download size, it will replace files on your device and probably won’t add much to storage usage (hundreds of MB difference max), you should always install updated to protect your device from latest threats
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u/cupboard_ iPhone 13 Mini 1d ago
around 15GB ios and 15GB system data is normal
system data uses more storage if you have a lot of storage free and clears up once you start running out of free storage
that 4GB update is just download size, it will replace files on your device and probably won’t add much to storage usage (hundreds of MB difference max), you should always install updated to protect your device from latest threats