If you rely on third-party service providers such as Dropbox, Google Drive, Amazon and so on for storing your data… and if their cloud is the primary home for your data, it’s only a matter of time before you lose access to it… or worse, get breached.
They have their uses, but your data is your responsibility. Especially if it’s mission-critical data that your business needs. In-house data servers are so cheap that there really is no excuse for not using one, or more.
I only use third-parties as doomsday backups, and the data stored on there is encrypted so hacks don’t scare me anyway.