Hi there!

Please note snapshots are incremental backups, which means that only the blocks on the device that have changed after your most recent snapshot are saved. This minimizes the time required to create the snapshot and saves on storage costs by not duplicating data. Please refer to [1] on Amazon EBS snapshots.

I hope you find the above information helpful.

Have a great day ahead!

References:

[1] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSSnapshots.html