Disk Cloning Software for External Drive Backup?

Hey everyone, I have an external drive where I store all my documents and a large collection of photos (I’m a photographer). I want to create a clone of this external drive onto another external drive, so I have a backup in case the main one fails. I’m looking for a tool that: * Clones external drives (not my internal system drive) * Supports incremental updates (so I don’t have to copy everything each time) * Is reliable and easy to use Any recommendations? Thanks!