Hello,
A quota specifies the storage limit values for the maximum amount of data that can be stored in a site collection. So this means you have too much data in your collection which exceeds the maximum amount of data.
I would suggest you change storage limits for a site collection to avoid the error.
Please refer to this article for more:
https://docs.microsoft.com/en-us/previous-versions/office/sharepoint-server-2010/cc263480(v=office.14)?redirectedfrom=MSDN
Best Regards,
Michael Han
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