For what it’s worth, Time Machine doesn’t seem to care as much which file system it goes to anymore, as long as it goes over SMB.
There are specific config settings to make it work , but nearly all servers , including synology, will have a button that does whatever the magic combo is.
Even the pre-iPhone ones were pretty crazy. He’d make you want to go out and buy the thing even if you didn’t need it. I distinctively remember going and “finding” a beta of OSX before it was publicly released after seeing one of his first key notes back (I don’t exactly remember why I was there, but I was). [“…It’s Liquid- makes you want to lick it…”]
looking back, kind of scary really…