In the distant past (2007 to 2011 or so) I experimented with using a number of different NAS platforms as Time Machine destinations including at that time FreeNAS as well as some commercial products ...
My current Time Machine drive is a 4TB HDD I've been using for...probably like a decade at this point. It's been very reliable. But being an HDD, it has the obvious downsides of noise and slowness.
Time Machine is Apple's backup system that automatically saves your Mac's files. Here's how to use the macOS file protection feature. Time Machine is an app that Apple ships with macOS and that helps ...