## Storage

In Active Backup for Business > Storage, you can monitor the status and storage usage of each shared folder.

- Running tasks: whether there is any running backup task.
- Deduplication ratio: the number caculated from original source data size divided by actual stored data size. For example, the original source data is 100G which is also written to the disk, and then only 80G data are stored on NAS after deduplication. Then the deduplication ratio will be 100G / 80G = 1.25x. For the second backup with CBT, only changed data will be added instead of adding the whole data size again. If the transferred size of changed data is 10G and 5G data are stored on NAS in the second backup, the deduplication ratio will be (100+10) / (80+5) = 1.29x.
- Device count: the number of backed-up devices in the shared folder.