Messages in iCloud
Also known as: messages in iCloud, iMessage iCloud sync, sync messages iCloud
Messages in iCloud stores your entire iMessage and SMS history — including photos and attachments — in iCloud and keeps it in sync across your devices. It can free device space by offloading old attachments, but the data then counts against your iCloud storage.
- Syncs full message history across Apple devices
- Offloads attachments off the device to iCloud
- Attachments are the biggest space driver
What it does
With Messages in iCloud on, your conversations and their attachments live in iCloud and appear identically on every signed-in device. Delete a message on one device and it disappears on all of them. You enable it in Settings > [your name] > iCloud > Messages.
Because the full message archive moves to iCloud, the on-device footprint shrinks — but the same data now counts toward your iCloud quota, so a heavy message history can be a major iCloud consumer.
Attachments drive the size
Photos, videos, and files sent in chats are usually the largest part of a message library. Reviewing large attachments under Settings > General > iPhone Storage > Messages and deleting old ones is the most effective way to cut the space messages use.