Know patrons and circulation features.
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Get there: More > Tools > Patrons and Circulation > Patrons (anonymize, bulk-delete)
This tool allows you to bulk anonymize circulation histories (this means that you keep records of how many times items were checked out - but not the patrons who checked the items out) or bulk delete patrons (remove them from the system completely).

To either delete or anonymize patrons
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Check the 'Verify' box on the task you would like to complete (Delete or Anonymize)
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Enter a date before which you want to alter the data
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If deleting patrons you can also choose to find patrons who
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have not borrowed since a specific date
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have accounts that will expire before a specific date
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are in a specific patron category
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are in a patron list
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Click 'Next'
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A confirmation will appear asking if you're sure this is what you want to happen
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Clicking 'Finish' will delete or anonymize your data