The most basic tip you can apply to your cloud accounts is choosing a complex and unique password. You should also switch on two-factor authentication if it is available. Enabling the authentication will add a protection layer to your cloud storage files.
Cloud storage services are the best way for collaboration. But it can also leave your data open to unauthorised access if someone else finds those links. Be careful when sharing your files and folders. It is also a good idea to run a regular audit of all the sharing options that you have enabled on your account.
Most cloud storage platforms have a recycle bin which temporarily stores data for a few days or weeks to help you restore them. However, you need to make sure that sensitive files that you are deleting must be completely out of the system and nobody should be able to recover them.
Even if hackers aren’t able to get into your account, they can try to hack using connected third apps. Make sure you are regularly checking which third party applications has access to your cloud storage. Remove any app that you are not currently using.
Most cloud storage services let you sync files from multiple devices. If you upgrade your phone or get a new laptop, it is important that you properly disconnect and deactivate the old ones. Usually, this means signing out of the relevant app before uninstalling it completely. But you should also sign out inside the browser that you have been using.