Recently i have found an interesting webinar from Microsoft Virtual Academy that describes storage quota in SharePoint Online. I will try to summarize that content based from my experiance.
Prerequisites
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SharePoint Online: software boundaries and limits:
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Manage the Recycle Bin of a SharePoint site collection
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Enable and configure versioning for a list or library
Steps to managing space
Go to “Site Collection Administration/Storage Metric” to determinate usage of site collection and check the Recycle Bin and Version Settings.
The options are:
- Purchase more storage
- Empty Site Collection Recycle Bin
- Document Library Version Settings
Empty Recycle Bins
They reside in site collection
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User’s Recycle Bins
–Only items deleted by the current user
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Site Collection Recycle Bins
–All items deleted by all users
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Items not manually emptied will automatically be removed after 90 days
Source: MVA