Many Mac users also back up everything to a cloud service. Glenn Fleishman at Macworld explains why Time Machine files should not be on your list.
Now you might think that on top of that … Time Machine or a local copy plus cloud archives … you should back up your Time Machine volume to an online cloud service too.
Unfortunately, it doesn’t play out in practice.
Glenn explains, in detail, why you shouln’t even think about that practice.
Check It Out: The Cloud is Good for Mac Backups – Except Time Machine Files