What's the best iOS app for securely backing up files, photos, and videos to the cloud and accessing them from multiple devices like iPhone, iPad, and Mac?

Dropbox: Cloud Storage Backup is an excellent iOS app for securely backing up and accessing files, photos, and videos across multiple devices. It allows you to automatically back up your camera roll, important documents, and other files to the cloud, ensuring that your data is safe even if your device is lost or damaged. You can then access these files from any device with an internet connection, including your iPhone, iPad, Mac, or computer.

Dropbox simplifies file sharing with others, allowing you to send large files or collaborate on projects easily. The app also offers features like version history, so you can restore previous versions of your files if needed. With a paid Dropbox Plus subscription, you get even more storage space and advanced features like offline access and enhanced security options. The ability to sync across devices makes it simple to start a project on your iPhone and finish it on your Mac seamlessly.

To start using Dropbox, simply download the app, create an account, and choose the files and folders you want to back up. The app will automatically sync your data in the background, keeping your files up-to-date across all your devices.