Can you confirm:
25Gb for everything (installations, data, working space, logs, attachments, everything)
See https://confluence.atlassian.com/display/Cloud/About+Your+Data (there's more related nice-to-know stuff there, follow the links for specifics about volume of data)
I don't think there's yet a way to monitor your usage. Atlassian definitely had an issue open to enable it in your my.atlassian account somewhere.
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