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`
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@Manon Soubies-Camy is an engineer who has been an avid Atlassian user since 2014. She helps companies of all sizes transform the way they work with the Atlassian stack, including Jira and Confl...
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