Disk Safes use zlib also known as gzip compatible compression and are capable of delivering about a 2:1 compression ratio for most environments. Compression is performed at the Hard Disk sector level on the Host during a Backup by the CDP Agent. The compressed Disk sectors are sent over the network and stored in compressed form in the Disk Safe. Compression can be used on its own or in combination with encryption.
Not all data compresses well, such as zip files or other media that is already highly compressed. Sometimes the compressed results are actually larger than the uncompressed data. This scenario is automatically detected and the data chunks are not compressed.
The Compression Levels are as follows:
- No Compression
We recommend "No Compression" to complete Backups in the shortest amount of time over fast LANs (Local Area Networks).
- Compression 1 Through 9
Nine (9) is the highest level of compression.
For Backups over the Internet or other slow links we recommend using compression.
We recommend level 1 as it will deliver close to 50% compression on most data. The higher levels will yield better compression at a significant cost in time and CPU usage.