During your audit, you will be able to find pieces of documentations, scans, bills, and so on, that you could store safely in one place. For example, you could want to download a few sensitive mail attachment and store it into a cloud storage option, with a proper folder nomenclature. Why would you do so?
Simply for this : you’ll avoid questions like: “Is this in the mail account? On the mobile? On the smartphone? Or on a hard drive? Which USB key?”. Moreover, having your data stored on one place can avoid to use different passwords, encryptions, medias. Just be sure that your password for this cloud storage service is safe enough.