Capacity
Backup Capacity Planner
As with anything done in a form versus reality, "actual mileage may vary." However, we're trying pretty hard to come as close as possible in helping you plan the backup location capacity you need.
There are other ways to calculate capacity as well. When you are planning backup capacity for computers that are very document centric (like file servers or database servers) then the most accurate way to get a handle on how much space you need is to measure how many documents you have, and how many of them have changed in the last 30 days. Each time a document changes, it will need to be backed up. For example, if you have 3 documents at 10 MB each, and 1 of them changes each time you back up, your first backup will take 30 MB and then your second will add another 10 MB for that changed file.
This isn't an impossible task at all. There is a product called LANsurveyor that will take this measurement for you and provide you with the results. We cover it in great depth within the book. LANSurveyor is made by Neon Software.
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Capacity
