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Well, you could, theoretically, mount windows share on linux and then use borgbackup. This has added benefit that windows PC does not need credentials to access linux, so if windows PC is compromised it will not be able to kill backups.
I'm using rsnapshot, which keeps older backups in a hardlink tree in a fashion comparable to Time Machine (although retrieval is not quite as comfortable). It uses rsync internally, which should also be possible for backing up a Windows client, although I have no personal experience.