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Can you really recover your data? - page 6 / 17

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The ‘Dead Money’ Argument

  • Backup strategies cost money and the benefit is often difficult to quantify.

  • Need to understand from the point of view of NOT having the required strategy (e.g., unplanned service outages & data loss).

  • Achieving low RPO and RTO can cost significantly more money.

  • Cost is justified by knowing the cost of ONLY achieving a certain RPO/RTO.

  • For example

    • Strategy costing £5k gives you a 60 minute RPO and a 2 hour RTO.

      • Possible revenue loss £100k

    • Strategy costing £10k per year gives a 10 minute RPO and 30 minute RTO. Possible revenue loss of £5k

    • Use the £10k backups once in 10 years and it pays for itself.

www.Comp-Soln.co.uk

Copyright ©2005 Comprehensive Solutions International Ltd.

All Rights Reserved

Defining your RPO

I want an RPO of 10 minutes, but tell me what it would take for an RPO of zero’

  • RPO zero is everyone's ideal, but is it realistic?

  • This client knew (from bitter experience) that there can be a large price tag on that.

  • DBMSs give RPO 0 recovery for loss of the database itself

    • Most single item failures are covered.

  • INGRES: Impact of losing JNL, Log file, last checkpoint etc.

  • Key to achieving an RPO lies in the ‘backups of the backups.’

  • Non-database files need to be considered

    • Source code

    • Interface files

    • Documents

    • Customized configuration files, terminal map files, etc.

www.Comp-Soln.co.uk

Copyright ©2005 Comprehensive Solutions International Ltd.

All Rights Reserved

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