Configuring the DS-System : Managing system activities : Running system compression
 
Running system compression
If a backup set has been configured in DS-Client with no compression type, you can run system compression on the backup set to compress any uncompressed data in the DS-System online storage. The DS-System uses ZLIB for the compression type and only compresses files larger than 32 KB.
NOTE:  To run system compression on a backup set, DS-Client encryption key management must be enabled and the DS-Client encryption key(s) must be forwarded to the DS-System. For more information, see “Configuring the encryption keys settings”.
To run system compression:
1. In the Customers tab, browse and select the backup set on which you want to run system compression.
2. Right-click the backup set and select Run System Compression. The System Compression dialog box appears.
F1 Help: "System Compression"
Select the options for the compression.
3. Click OK.
You can verify the system compression results in the activity log.