Hi RizJuku,
Thanks for contacting Apple Support Communities!
We understand that you'd like to know if the Documents & Data shown in the photo are stored in iCloud or on your iPhone, correct?
You're viewing Documents & Data which is stored in iCloud. If you delete it, it will delete your iPhone backup from iCloud.
If you'd like to view your iPhone storage, you can go to Settings > General > iPhone Storage.
If you'd like to learn more about how to manage your iCloud backups, this is a handy resource to help you: View and manage iCloud device backups
For more information about your iPhone storage, check this out: How to check the storage on your iPhone, iPad, and iPod touch
We hope this helps.
Cheers!