AWS CloudShell data is scheduled for deletion

So, hopefully you have your data on an EC2 instance and you have automated snapshots configured.

When you use CloudShell, it creates persistent storage where you can store data, like a home directory. You should not be storing important data in CloudShell as there is no way for you to automate the backup of that data.

I'm 99% sure that where ever you host your newsletter is not dependent on CloudShell. If you add a comment about your hosting architecture we can make a better judgement.

Also, please take a look at Security best practices in IAM concerning the use of root user.

I might have to contact my host, because this is all a bit over my head :( Basically, I use Sendy, a "host your own" newsletter program. I use AWS Simple Email Service as the sender. My Sendy program itself is hosted on a separate server, it just connects to AWS when I'm sending my newsletter. So I wasn't even aware I had to log into a CloudShell console thing occasionally after it was set up, since I don't actually do anything in AWS once the system is done with the initial setup.