3 backup strategy, a minimum:
1. time machine local backup
2. regular cloning of startup disc, hand off to friend or relative in town
3. automated online backup; I prefer backblaze
Anything less = no backup
Many ways to skin a cat, but this is very solid advice. ^^^
I'll add to #2, that you can also keep offsite backups in a storage unit or safety deposit box, and if you have friends or relatives out of town, that might be a good idea if your locality is one where there are tornados, forest/wild fires, or earthquakes.
I personally don't love the paid cloud options so I don't use them. But as remote sync goes, you could do it for free as I saw one member here did. He had set up a backup drive at a relative's house in person, so it would sync overnight with his main drive at his home. That would be extremely practical if there were a simple turnkey solution which did it.