No worries, just wanted to warn that while Time Machine is great, it can/does delete stuff from time to time in a sort of 'thinning' process.I can't comment on that, but what I do is manual sporadic back-ups. Target is once a week, though I don't always hit that.
If you're using a relatively recent version of MacOS, one cool thing is that it will actually save TimeMachine stuff (files for backup) in a hidden way and then save them to your TM drive when you connect it. So it's actually doing some additional saving you may not notice. (Obviously this is within the limits of drive space etc).