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The edition you're referring to does not mention FREE version, it states the difference between 3 paid editions of Veeam B&R. This is the link
that describes the capabilities of Veeam Backup Free Edition. As to your question, then your second link describes it correctly. To run incremental backups, paid edition is required.
On a side note, please note that file copy jobs are intended to be used for copying files rather than backing up VMs. Here is a brief description
of all job types available.