mailbox database size before & after backup

Hi there

i recently made a similar thread and someone told me that i should do it here so here is my issue :

i've been assigned to do a specific report related to exchange and its backup 
so what we want is a report that would give us the global size of all our mailbox databases before and after the backup ( even the size of the logs before and after)
(example : we have a mailbox database X: , we need to go inside the data folder, and retrieve the size of the .edb
then do the same thing with the logs, go inside the logs folder, and retrieve the logs size )

i was wondering if anyone ever managed to pull a script that does similar things, given the fact that i ve never worked with powershell and my knowledge is kinda limited in that area

Thanks