I know this is an older post but I wrote a SQL query that will pull all your spaces and display the total attachment size for each space:
If you have access to the DB you could run the following query to get an estimate:
SELECT S.`SPACENAME`, C.SPACEID, CONCAT(ROUND((SUM(A.`FILESIZE`) / (1024 * 1024))), ' MB') AS 'SIZE'
FROM ATTACHMENTS A LEFT JOIN CONTENT C ON C.`CONTENTID` = A.`PAGEID` LEFT JOIN SPACES S ON C.SPACEID = S.SPACEID
GROUP BY C.`SPACEID`
Hey there Community! My name is Vannya Vallejo, the Channel Communication Specialist at Atlassian and I want to help Atlassian users like you learn about our Solution Partners and how they c...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs