There[SQ]s no single, universally known application or program called "Data Guardian" specifically for Mac. The name might be :

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A specific company[SQ]s product:

Many companies offer data security and privacy software, and some might use "Data Guardian" in their product name. You[SQ]d need to provide more context (like the company name or where you saw this term) to identify it.

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A misremembered name:

You might be thinking of a similar-sounding program. Perhaps it involves data protection, encryption, or access control.

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Internal terminology:

It could be an internal name used within a company or organization for a specific data security process or tool.

To find out what "Data Guardian" refers to, please provide more information about where you encountered this term.