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shadow copy

/ˈʃædoʊ ˈkɒpi/ - n.

1 [colloq.] The copy that the deletion request, the lineage diagram, and the retention schedule all politely declined to know about.Keep. Punchy.This is the problem.

Working definition

2. An unmanaged duplicate of governed data, created outside official systems and absent from the inventory.

Promoted

See also

data discoveryThe tool whose first scan is reclassified internally as an incident.
data maskingThe careful obscuring of the production data, in the one environment, that a different team had already copied somewhere else.
right to be forgottenA right honored in production, in staging, in the warehouse, in the lake, in the backups, and in the seventeen exports nobody mapped.