A 2-drive Synology (e.g. DS225+) in RAID 0 or RAID 1 works fine for this, for 90% less than this beast. Synology documented their optimal settings for Time Machine a couple years ago, too. Hope this is helpful. [1]

[1] https://kb.synology.com/en-us/DSM/tutorial/How_to_back_up_fi...