Companies should use a recovery point objective (RPO) to determine how much data they can potentially lose during any given disaster. For example, if users update data in a real-time application (such as a Web-based purchasing system), your RTO should be as close to zero as possible (within the limitations of your systems). But if these systems save data infrequently (such as a file server used mostly for read-only files), your RPO can be 24 hours or more.
If your RPO really is 24 hours or more, your organization can potentially use tape backup as its sole DR solution. However, it's imperative that you follow best practices, including moving tapes off-site on a regular basis and performing test restorations from the tapes to ensure data integrity.
If your company's RPO is less than 24 hours, don't rely on tape as your sole DR solution. It's too risky to depend on a tape backup that more than likely occurs just once a day; if a system goes down before the backup window, you could easily lose an entire day's worth of data.
Instead of tape backups, begin investigating data replication solutions. Available for a great range of prices, these tools generally offer the ability to fail over to other servers and perform additional tasks.
The closer your RPO gets to zero data loss, the more expensive your DR solution will likely become. Keep in mind that solutions that ensure absolutely zero data loss nearly always require large-scale disk-based storage arrays and much more bandwidth than other types of data-protection systems. However, bumping up an RPO to anywhere from a few minutes to several hours can expand your options dramatically.
It's vital that your organization recognizes and understands both the benefits and the risks of using only tape backup as a DR solution. Relying solely on tape backups, particularly if you're not using them effectively, can give your business a false sense of security about its disaster recovery strategy.
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