1. How much data or percent of data is really stored on tape for onsite backups vs how much data is archived for long term?
2. If you could store more data faster on cheaper disk, would more stay onsite?
It depends on how far back the company wants to be able to restore without having to go offsite. This is usually a month to three months, depending on the company and their budget. I personally prefer three months. If you're using disk this isn't hard because you only need one full backup and three-month increments.
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