can you back up text messages?
Can you back up text messages in i-cloud for later viewing?
iPhone 11 Pro Max, iOS 13
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No. If you use messages in iCloud - Keep all your messages in iCloud - Apple Support, then your messages are synced across all of your devices as long as you choose to keep them. Delete those messages on any device(s), and it's deleted on all devices including iCloud.
What does iCloud back up? - Apple Support
If you don't use this feature, then it will be part of another backup which you can restore if lost - Restore your iPhone, iPad, or iPod touch from a backup - Apple Support.