Total compression is the total amount of compression the Data Domain system performs with the data it receives. The first backup in our testing is entirely unique data and thus has the lowest total compression ratio (TCR) of 1.3.
The following figure shows the TCR that we observed in our testing.
Figure 11. Total compression ratio results for the Ready Solution Scale-out
A higher TCR means a greater savings on the Data Domain system. The second backup had a TCR of 21.3 and the third backup had a TCR of 36.9. The TCR shows a substantial Data Domain space savings over backups. Technologies such as deduplication and compression enable the IT organization to do more with their investment in Data Domain protection.