Forum Discussion
Sharepoint storage size over twice as big as the actual storage size
There are potentially multiple causes.
The main one is the presence of document versions. This may result in 100's of versions consuming your storage quota. To reduce this contribution limit the number of versions (setting per library) or use scripts (as @kalpeshvaghela suggested) or tools that can report on version hot spots (https://directory.collab365.com/listing/slim-companion-explorer/) and purge versions.
Also clear the primary and secondary recycle bin because they also count towards your storage quota consumed. If you do not empty the bins they will count towards your quota consumed for 93 days.
SharePoint property promotion will also increase your storage consumption. By adding additional metadata to files the files sizes increases by a small amount (5-10 kB) each. If you have 1 M small emails these kind of effects becoome noticable though. This only affects Office files, msg emails and tiff files. File types like jpg, pdf, ... are not changed and keep their original size.
