Make one of these backups out of metal, such as steel backup, because with all the geopolitical variables, fires, floods, disturbances, earthquakes, or wars may occur, and therefore it is better to keep one of the options from steel backup, as paper will not help you in such things.
Well, the reason I don't suggest metal is:
1. Too much hassle and more expensive.
2. The possibility of 2 out of 4 backups being destroyed at the same time is extremely low.
3. In case of fire or flood, I prefer my backup to be totally destroyed, rather than not. If it survives, who know who will capture it.