I want to create a backup of my Amazon Lightsail instance to save my work.
Create a snapshot of your Lightsail instance to use as a backup. Lightsail snapshots preserve the state of your instance at the time the snapshot was taken.
After you create a snapshot, delete the running Lightsail instance. If you need that instance again, you can create a new Lightsail instance from that snapshot.
Note: Snapshots are billed at a lower rate than running Lightsail instances.
Snapshots in Amazon Lightsail
Amazon Lightsail pricing