The main difference between them are mainly on the number of storage location that they consist of.

This type of backup destination consists of a single storage location.  Backup data from backup jobs performed after creation of the destination will be stored in this single storage location.

For example:

In the above example, backup data will be uploaded to the Google Drive storage configured.

This type of backup destination consists of multiple storage locations.  Backup data from backup jobs performed after creation of the pool will be stored across the multiple storage locations.

**Note:**
It is recommended that the storage added to a single destination pool are of the same type.

For example, all storage being cloud storage locations, or local drives.

Do not use mixture of different storage types in a single destination pool (e.g. local drive and cloud storage in the same pool).

For example:

In the above example, backup data will first be uploaded to the OneDrive storage configured.

When the OneDrive storage (e.g. first storage location in the list) is full, or when the backup quota configured for that storage is reached, backup data will continue to be stored to the Dropbox storage (e.g. next storage location in the list).

Note that you can add additional storage locations to a destination pool at any given time, but once a storage location is added to a destination pool, it cannot be edited (except for its name) or removed.  To remove the storage, the entire destination pool must be deleted.

**Note:**
CBS cannot be set as a storage location for a destination pool.