This setting will automatically remove older messages, keeping your conversations manageable. Note: Deleting messages from your Mac does not delete them from other Apple devices unless you have ...

You can clear an iCloud account's storage in several ways to free up space and avoid having to pay for extra storage.

Messages is designed to sync across all your devices logged into to the same iCloud account. iMessages sync by default; SMS/MMS and RCS messages sync if you’ve enabled access to them from your iPhone.