Technically, the problem is solved by either one. A service like 1password is in the business of not serving you up a corrupt database. A backup solution also works here if you don't want to rely on other services.
Sure, if 1Password's cloud service can inspect and validate the structure of the vault. I kind of hope they can't since the vault should be encrypted, but I'm also not quite that naive.
I firmly believe you can't expect cloud services to do anything but serve up exactly what you give them. If you give them a corrupt database, they will happily serve you up a corrupted database.