Hello everybody,

I have a mathematical question regarding data growth when using BE2012 deduplication. Here are the numbers:

Start data volume: 7,2 TB (this is actual data that needs to be backed up)

Change percentage per day: 0,3%

Monthly growth: 3%

How can I calulate the actual growth of data to know what the volume of the deduplication store will be in 5 years. What I have done now is the following:

Month 1:

Data volume to backup: 7,2 TB

initial backup + (change % per day x 30,5 days avg in a month) = 7,85 TB dedup store size at end of month

To calculate the dedup store size for the next month :

Last month data growth = previous month data volume to backup x percentage of monthly growth = 0,216 TB

Current data to backup = Previous month data volume to backup + 0,216 TB = 7,416 TB

Total data change per month = (Current data to backup x change % per day) x 30,5 days avg in a month = 0,678 TB

dedup store size last month=7,85 TB

dedup store size this month = 0,679 TB +7,85 TB = 8529 TB

When setting the retention period to 1 year and 1 month, after this period you can substract the data that has been backed up 1 year and 1 month ago from the dedup size every month. Correct?

And so on for every month. Am I correct? This would mean that the size of the dedup store is 66 TB after 5 years in my calculation.