To calculate backup capacity, multiply the total data size by the redundancy factor and divide by 1−Compression Ratio.

Backup capacity is essential for ensuring that data is properly stored and protected against loss, while considering redundancy and compression. The Backup Capacity formula helps calculate the total storage capacity required, taking into account the size of the data, any redundancy, and the compression applied to the backup files.

**Formula:**

$\text{Backup Capacity} = \frac{{\text{Total Data Size} \times \text{Redundancy Factor}}}{{1 – \text{Compression Ratio}}}$

Where:

**Total Data Size**= Size of the data being backed up**Redundancy Factor**= The factor for redundancy (e.g., 2 for mirroring, 1 for no redundancy)**Compression Ratio**= The compression applied (e.g., 0.2 for 20% compression)

**How to Calculate ?**

**Determine the total data size**that needs to be backed up.**Identify the redundancy factor**, which accounts for data duplication for safety (mirroring or backups).**Specify the compression ratio**based on how much compression is applied to the data.**Apply the formula**: Multiply the total data size by the redundancy factor and divide by $1 – \text{Compression Ratio}$

**Solved Calculations**

**Example 1:**

**Total Data Size**: 500 GB**Redundancy Factor**: 2 (mirrored backup)**Compression Ratio**: 0.2 (20% compression)

Parameter | Value |
---|---|

Total Data Size (GB) | 500 |

Redundancy Factor | 2 |

Compression Ratio | 0.2 |

Backup Capacity (GB) | 1250 |

**Answer**: The required backup capacity is 1250 GB.

**Example 2:**

**Total Data Size**: 1000 GB**Redundancy Factor**: 1.5 (partial redundancy)**Compression Ratio**: 0.4 (40% compression)

Parameter | Value |
---|---|

Total Data Size (GB) | 1000 |

Redundancy Factor | 1.5 |

Compression Ratio | 0.4 |

Backup Capacity (GB) | 2500 |

**Answer**: The required backup capacity is 2500 GB.

**What is Backup Capacity Calculator ?**

A Backup Capacity Calculator is a helpful tool that estimates how much storage you need for your data backups. This calculator can come as software, an app, or even in an Excel format. It allows you to input your data size and the frequency of backups to determine the required capacity.

When using a **Veeam Backup Capacity Calculator**, you can quickly see how much backup space you need for systems like Microsoft Office 365. Knowing the right capacity helps avoid issues like running out of space when you need to recover your data.

To calculate your backup needs, you might ask questions like, “How much data do I need to back up?” or “What is the best backup rule to follow?” For example, the **3-2-1 backup rule** suggests having three copies of your data, stored on two different media, with one offsite. This way, you ensure that your data is safe and retrievable when needed.

Whether you choose a free backup capacity calculator or a specialized tool, the goal is the same: to safeguard your valuable data effectively.