AWS EBS

DeleteOnTermination attribute:

The EC2 instances will have Root EBS volumes. When you terminate an EC2 instance, the Root EBS volume will also get deleted. To prevent this, set the DeleteOnTermination attribute, for the EBS volume, to false. This will prevent the EBS volume from being deleted even when the EC2 instance is terminated.

A comparison of EBS volume types:

General Purpose SSD - recommended for most workloads

Provisioned IOPS SSD - use this when the required number of input/output operations per second is high (10000 IOPS or 160 MiB/s of throughput per volume)

Throughput Optimized HDD - use this for a fast throughput at a lower price

Cold SSD - use for large volumes of data which are in frequently accessed

Where are the snapshots stored?

In S3.

Can you directly create a snapshot in another region?

No. You have to create a snapshot in the same region and copy that snapshot to another region.

Is it safe to copy the snapshot to another region? What if others access my data?

The snapshot's data are protected by S3's server side encryption.