How can I restore everything I have deleted on my iphone
How can I make sure everything is completely being saved so I can restore and back up
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"How can I restore everything I have deleted on my iphone"
By restoring a backup
"How can I make sure everything is completely being saved so I can restore and back up?"
By a regular backup routine, preferably by using a computer and manually archiving backup versions
How to back up your iPhone, iPad, and iPod touch – Apple Support
Restore your iPhone, iPad, or iPod to factory settings – Apple Support
Restore your iPhone, iPad, or iPod touch from a backup