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We’re all prone to errors, and it’s not uncommon to accidentally edit the wrong document or mistakenly delete a passage of text. The good news is that SharePoint offers version history, which allows you access to previous versions of a document.
To access a previous version of a document, simply right-click on the document and select “version history.” You’ll then see a list of all the previous versions of the document and you can select the version you want to revert back to.