When you create a new backup policy, you have the ability to add tags to the snapshot or AMI you are creating. 

In the CREATE NEW BACKUP POLICY section, once you have applied your policy to your chosen Instance IDs or Instances with existing Tags, you can then click on ADVANCED.

Here, you will be presented with these in the ADD TAGS TO BACKUPS section of the backup policies page, where you can choose custom tags to be applied to each backup created by this policy, or inherit tags from server resources.

Once you have added your custom tags, you can then Save your policy.

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