How to Sync Messages from iPhone to Other Devices (iOS 11.4, macOS 10.13.5)?
My goodness!  200GB!?  Unless you have chosen to put a gargantuan amount of data in your iCloud account, I'd recommend paying $.99 a month for 50GB and seeing if that isn't sufficient.  I have 50GB and have used only 13.4GB so far:  photos &amp; videos, Mail, documents, backups, and Messages.