When you copy an AWS EC2 snapshot, you can choose to encrypt the copy

Encrypted Snapshots
When you copy a snapshot, you can choose to encrypt the copy (if the original snapshot was not encrypted) or you can specify a CMK different from the original one, and the resulting copied snapshot uses the new CMK. However, changing the encryption status of a snapshot during a copy operation results in a full (not incremental) copy, which might incur greater data transfer and storage charges.

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When you copy an AWS EC2 snapshot, you can choose to encrypt the copy

Encrypted Snapshots When you copy a snapshot, you can choose to encrypt the copy (if the original snapshot was not encrypted) or you can s...