Protecting your online cloud storage from unauthorized users is an important process. Here are some steps you can take to secure your files:

1. Set unique and strong passwords for each account/service.
2. Make sure to use two-factor authentication.
3. Consider using encryption software and apply encryption protocols for protecting data.
4. Read and review the terms and services of each cloud service provider.
5. Make sure to back up any relevant information to have a safety copy.
6. Consider using remote access tools to monitor suspicious activities.
7. Review access policies for remote users and set permissions accordingly.
8. Stay up-to-date on the current security trends.