Why would you bother to back up your iMessages? After all, they’re all stored in iCloud these days, right? Well, yes your messages are all stored in iCloud, but they’re not backed up up there. They’re synced, which means that if you delete a message thread, it’s gone forever. The answer is to make a local backup, which requires a Mac. Which is ridiculous in 2019, but there you go.
Here’s how to back up your iMessages in case the worst happens.