VM backup deduplication rate

hi Team, 

Please check the attached screenshot and help me to understand , what is the de-dupe % meaning here -

78.20% data is dedupe  and only 21.80% data is written to MSDP pool  ?

or

78.20% data is written to MSDP pool and 21.80% data is dedupe ?

and why datasize is 9 GB in both the cases - full backup and incr backup .

thank you.