Will restoring iPhone from backup delete everything?

Related questions

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5. What is the difference between restore iPhone and restore backup?
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Tags

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2. #deleted
3. #information
4. #restore
5. #doesn
6. #everything
7. #files
8. #process
9. #restoring
10. #means
11. #replaced
12. #itunes
13. #matter
14. #removed
15. #icloud
16. #current
17. #backup
18. #choose