To secure critical backup remotely, we can use S3 bucket. Here is a bash script to sync a directory to/from a S3 bucket.
I put up a problem set based on my prep notes on AWS certification. Hopefully it helps for your exam preparation.
Here are free questions and quiz links, to better examine your knowledge about AWS. Before you take AWS exams, why not checkout them? Feel free to add more questions or quiz by comment.
Usually step-by-step examples is an easy and direct way for people to learn more about complex systems. Check below examples and learn for real of AWS features.