Snapshot in lightsail

Unfortunately, automatic snapshots are not supported for Lightsail on Windows.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-configuring-automatic-snapshots

Automatic snapshot is currently not supported for Windows instances, or managed databases. Instead, you must create manual snapshots of your Windows instances or managed databases to back them up. For more information, see Creating a snapshot of your Windows Server instance in Amazon Lightsail and Creating a snapshot of your database in Amazon Lightsail. Managed databases also have the point-in-time backup feature enabled by default, which you can use to restore your data to a new database. For more information, see Creating a database from a point-in-time backup in Amazon Lightsail.

Also, in the case of Windows, you must stop the system once as per the procedure in the following document when manually creating a snapshot.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/prepare-windows-based-instance-and-create-snapshot

Hi Deva, You don't have to develop that by yourself: it already exists. See full explanations on https://lightsail.aws.amazon.com/ls/docs/en_us/articles/understanding-instance-snapshots-in-amazon-lightsail#automatic-snapshots.

Hope it helps!

Didier

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