Firewalls

a small subset of sensitive information needs to be encrypted, addi-

tional space will still be required. Make sure that enough space exists

to accommodate new fields, metadata, and the temporary space that

will be required to perform the data migration.

16.7.8 Backups during pre-migration

Finally, even if sensitive information in production databases is

securely protected, it is important to be aware that sensitive data

may still exist in the clear in such places as tape backups and data-

base backups. An enterprise must identify all of these locations and

replace them with new backups in which the sensitive information is

protected.

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16.8 Summary

This ...