I have a question about the mailboxes I've created in Apple Mail. I create mailboxes to organize messages I want to keep. I've always just had them "On My Mac" instead of putting them in iCloud. I'm curious to hear what others do, as I'm wondering if I'd be better off putting all of these mailboxes in iCloud. I back up my Mac once a week to an external drive and I back up to iCloud-do the mailboxes "On My Mac" back up? Thanks for your help.