See global storage used in admin pannel

Hello,

in admin pannel --> Info, I would like to see what’s used et and what’s is reserved on the server :
User 1 : 10 Gb / 100 Gb
User 2 : 10 Gb / 100 Gb
User 3 : 10 Gb / 100 Gb
User 4 : 10 Gb / 100 Gb
User 5 : 10 Gb / 100 Gb

I would like to see in Info : 50 Gb / 500 Gb used (something like that)