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Estimate Future Backup Space Requirements

Arcserve UDP Agent (Windows) provides you with this tool to calculate the estimated amount of available free space that you will need for backups. The calculations are based on your estimate of future data change and on the space that is occupied from previous backups.

Backup Space Calculator

To use this estimating tool

  1. Select the backup source. This can be your entire machine or selected volumes within your machine.

    The actual size of the selected backup source is displayed in the Total Source Size field.

  2. Estimate the anticipated Change Rate for future backups.

    Base this estimate upon past performance of how much your total backup size has changed for each subsequent incremental backup.

    With the Estimated Values defined, Arcserve UDP Agent (Windows) calculates and displays the estimated backup size required based on the configuration of the backup destination and the recovery points. The pie chart also displays the amount of used space and free space.

  3. Estimate the Space Saved After Compression percentage value.

    Estimated Values

    You can use estimated values to calculate the approximate overall backup size that is based on the number of recovery points. Base this estimate upon past performance of your backups with different Compression settings applied. As you change this value, you will see the corresponding size impact for your backup sizes.

    Note: If necessary, you can perform some Full Backups, each with a different Compression setting (No Compression, Standard Compression, and Maximum Compression) to establish past performance values and help you to better calculate the percent of space saving that each setting produces for your backup.

    Estimated Backup Size

    Displays the estimated values for Total Source Size, Compressed Full Backup Size, Compressed Incremental Backup Size, and Estimated Total Backup Size.

  4. From this Estimated Total Backup Size value, you should be able to determine if your backup destination has sufficient space to fit your backup.

    If your destination does not have sufficient free space, you can consider the following corrective actions: