Online-syncing services like Dropbox or OneDrive serve a different purpose.
Most offer unlimited (or at least a lot of) storage for a flat subscription fee, and many, including Acronis, can also make local file backups to an external hard drive.
Some of these services also back up system files, applications, smartphones, tablets and external hard drives to the cloud. Online-backup services, or cloud backup services, make an online copy of every personal file on your computer. Acronis Cyber Protect Home Office: Cloud backup services defined
