[disk_shadowing = replicación de discos]]

Mecanismo de respaldo consistente en que los datos se graban simultáneamente en dos discos físicos o dos servidores.

A back-up process that involves writing images to two physical disks or servers simultaneously.

http://ithandbook.ffiec.gov/it-booklets/business-continuity-planning/appendix-b-glossary.aspx