You might want to do this, for example, to recover data from the system volume of a botched instance or to create a backup of the system volume like you would for a block storage disk. You can also use this operation to create a snapshot of an instance's system volume. You may remount and use your disk while the snapshot status is pending. Nevertheless, if you cannot pause all file writes to the disk, you should unmount the disk from within the Lightsail instance, issue the create disk snapshot command, and then remount the disk to ensure a consistent and complete snapshot. If you can pause any file systems on the disk long enough to take a snapshot, your snapshot should be complete. This may exclude any data that has been cached by any applications or the operating system. You can take a snapshot of an attached disk that is in use however, snapshots only capture data that has been written to your disk at the time the snapshot command is issued. You can use snapshots for backups, to make copies of disks, and to save data before shutting down a Lightsail instance.

Creates a snapshot of a block storage disk.

Hard drive snapshot