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The snapshots you see from the Redshift console are taken every 5 GB data change or 8 hours, whichever comes first. This is default setting for automated snapshots but you can increase the frequency to be every hour instead of 8 hours. The snapshots for SELECT statements and DML commands are internal snapshots, are invisible to you and are managed by Redshift internally. Also the RENAME command just executes a metadata update in the system tables. If you have specific requirements for snapshots above and beyond the automated snapshots then you will have to take manual snapshots to meet those requirements.
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