I would suggest TWO CCC cloned backups.
Keep one nearby the computer.
Store the second one "off-site" -- that means in a different building. It could be a locker where you work, etc.
The idea is that if you ever have a disaster at home, such as a fire or theft, you STILL HAVE a copy of your hard drive availalbe.
When I was working, I used a locker at work and updated the backup once a week.
Now that I'm retired, I keep my important cloned backups in my car on flashdrives and SSDs. The confidential stuff is on an encrypted drive, so that even if the car was stolen, all they get will be "a drive".
Works for me.
I also keep another backup in a fire and water resistant lockbox in the basement.
I don't use "online backups" of any kind. I don't trust them, and what happens if the company you're using shuts down? POOF goes your backup!
The reason I advise a cloned backup rather than Time Machine is that if you ever get into an "I can't boot!" moment (you'll see plenty of messages posted about that right here), you can generally get up-and-running again in two minutes by booting from your cloned backup...