For starters, iCloud has a 5GB limit (free tier). And that limit has been used up by lots of other things in addition to iMessages.
iCloud backups are also known to fail. Someone I know just can't get the backup to work on their iPhone.
iCloud backups are also known to fail. Someone I know just can't get the backup to work on their iPhone.
Go to the next Apple Store and enjoy a free unlimited in time support for theses issues.
Every time I came by a Genius Bar for support I have witness "dumbs" users crying tears of joy after an epic data recovery thanks to the dumb-proof iCloud backup (and that exactly why both my parents are backed up on iCloud, for some people "dumb-proofness" is more important than privacy concerns)