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SharePoint
A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
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Hi @IniobongNkanga-8038 ,
Welcome to Q&A forum!
The reduction in your SharePoint storage space from 5TB to 3.45TB could be due to several factors. SharePoint Online storage is calculated based on the number of licenses your organization has, starting with a base of 1TB plus an additional 10GB for each eligible license purchased. If your organization has fewer licenses or if there have been changes to your licensing plan, this could affect your total storage capacity.
If you suspect that your storage should be higher than what is currently displayed, you can run a diagnostic tool as a Microsoft 365 admin to identify any issues with your SharePoint Online tenant storage quota. This tool will show how the quota is allocated and help troubleshoot any discrepancies.
For your references:
SharePoint Online out of storage space
Good day!
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