Signal can do that. Both on Android and iOS. What it can't do on iOS is to create regular Backups (which it can on Android). https://support.signal.org/hc/en-

Signal can do that. Both on Android and iOS. What it can't do on iOS is to create regular Backups (which it can on Android). https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages https://support.signal.org/hc/en-us/articles/360007059752-Ba... I think it has something to do that Signal won't trust iCloud as Backup target.