Free software for performing backups of computers on the network?

Question

Backup

There is a network, some computers of users need to be backed up completely (accountants, for example), from some computers it is necessary just docks. Moreover, it is required that the backups can then be restored without problems, for example, as it is implemented in Acronis - it booted from a USB flash drive, found the image over the network and rolled it onto the hardware. Or just pull out the necessary file from the backup using Windows tools. Plus, it is desirable that there would be some kind of admin utility that would report whether backups were made, etc.
And all this should be free. Options?

Answer 1

If the entire OS, then: Veeam Endpoint Backup FREE
If documents, then Cobian Backup