無料 · ネットワーク・IT インフラ
バックアップ容量計算機.
データ量、変更率、増加率、バックアップ方式、GFS 保持、重複排除、オフサイトコピーからバックアップ容量を見積もります。
- Protected data after one year of growth
- 12 TB
- Daily changed data
- 360 GB
- Logical backup data
- 147.79 TB
- After compression and deduplication
- 73.9 TB per copy
- Restore points
- 31
- Oldest restore point
- 3 years
One copy before data reduction
| Component | Logical size (TB) |
|---|---|
| Full backups in the daily chain (3) | 16.61 |
| Incrementals (12) | 4.32 |
| Weekly points beyond the daily window (2) | 4.61 |
| Monthly points (12) | 86.25 |
| Yearly points (3) | 36 |
- An estimate: real change rates vary by day and workload, and incremental size counts each changed block once per day.
- With block cloning, a synthetic full only stores blocks changed since the previous one, estimated as 1 − (1 − daily change)^days; without it, every full point stores a complete copy. Data that changes the same blocks repeatedly needs less.
- The 3-2-1 rule: three copies of data, on two different media, one off-site — ideally one immutable or offline copy against ransomware.
使い方: バックアップ容量計算機
データを入力するかファイルを選び、設定を調整して結果を生成します。コピーやダウンロードの前に結果を確認してください。
制限と対応形式
入力内容はお使いの端末で処理されます。
英語の技術説明
An estimate: changes are assumed to fall on random blocks; real workloads often rewrite the same blocks. Product-specific metadata is not included. Everything is calculated in your browser; nothing is sent or probed on the network.
Fulls cost the full size; incrementals cost the daily change; with block cloning, a synthetic full stores the unique change since the previous one, 1 − (1 − c)^days. Totals are divided by data reduction and multiplied by copies and headroom.
10 TB with 3 % daily change, 14 daily, 4 weekly, 12 monthly and 3 yearly points, 2:1 reduction and two copies needs about 177 TB with block cloning.