Guidelines for estimating SnapVault secondary storage system volume size

There are guidelines you can follow to estimate the size of SnapVault secondary storage system volumes for growth over one year, depending on how often you back up data.

Three percent (3%) growth every day
Five percent (5%) growth every week
Ten percent (10%) growth every month
Seven percent (7%) monthly growth rate, compounded to 100 percent growth every year

Following is an example of how to estimate the daily backup.

Example: Estimating daily backup

Assume a starting baseline transfer of 1 GB and 100 percent growth of new data for the year (1 GB). The changed size due to daily growth if changes are made every weeknight is as follows:

Calculate daily backup by using the following equation: Size due to daily growth = (number of days x .03) - (new data)
For example, size due to daily growth = (250 x .03) - 1 GB = 7.5 GB - 1 GB = 6.5 GB of change

Therefore, for 1 GB of source data, you need 1 GB baseline + 1 GB new data + 6.5 GB of changed data = 8.5 GB secondary system volume. In other words, you must be able to scale the secondary system volume to about 8 times the current data set size within one year.