Tagging Amazon Resources
A tag is a label that you assign to an Amazon resource. Each tag consists of
a key and an optional value, both of
which you define. Adding tags to the various Amazon resources will not only make
managing your SAP environment much easier but can also be used to quickly search for
resources. Many Amazon EC2 API calls can be used with a special tag filter. Refer to
Amazon Tagging Strategies
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You can tag your EBS Volumes to identify their environment (for example Environment= DEV/QAS/PRD etc.) and use these tags to create backup policies for EBS Volumes
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You can use similar tags as in above example with EC2 instances and use them for patching your operating systems or running scripts to stop/start application or EC2 instances.