Even you use DynamoDB, you still need to remember to have backupss. I have seen a recent mishap when devops by accident dropped the production tables and restoration requires high IOPs in order to restore it soon enough. The IOPs was not that high for usual use case. But when you wants to reduce MTTR, you need to increase the IOPs (which means $$$, too)
Eventually your dropping of the database is consistent. So back it up no matter what.
Eventually your dropping of the database is consistent. So back it up no matter what.