Need help understanding Mailbox usage

[johnnyas]

According to the O365 admin center, our storage used for mailboxes is slowly increasing. As expected. Some days ago though, the graph started diving down. In a week it decremented more than 100gb (from 600gb +). Then it shot up again. Graph is attached.

This isn't us doing cleanup or anything, so whats happening here?

[#2 · Accepted solution]

There's an issue going on with reports currently, check your SHD:

Title: Microsoft 365 reports data may be inaccurate User Impact: Admins may notice that Microsoft 365 reports from January 10, 2020 to January 15, 2020 aren't accurate. More info: The affected reports are as follows: Exchange: Email Activity, Email app, Mailbox usage

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[#3]

@Vasil MichevExcellent, thanks!