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Only data written to the disk is captured in the snapshot, data in memory not yet written to the disk will be excluded. For non-disruptive backups this is generally considered good enough.
You do have an option on Windows to do VSS snapshots that can handle open files a little better (https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/application-consistent-snapshots.html)
If you need to make sure all data is written to disk first, the best way is to either shutdown the instance or unmount the volume being snapshotted.
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