Yep. But it works and has worked for over 20 years. Various backup software has come and gone in that time but rsync has been a rock.

Fwiw, Borg is coming up on 10. 12 if you include the project it forked from. I like the simplicity of rsync approaches, but Borg seems to have longevity and widespread use.

Restic is also around 10 years old... at least based on it's github commit history. I should probably look at them again at some point. Hard to get motivated to replace a working system for some disk space.

If you do end up kicking the tires, it might be worth looking at duplicacy as well.