Credentials can be backuped easily to any excel file. Steps to backup:
This project is under open source License. Source Code of this project is available on GitHub website which hosts public open source projects
https://github.com/dhananjay1405/tds-credential-manager-extension
Note: This extension stores credentials in the browser (of that PC) only. Credentials are not sent to any server ensuring it's safety. On clearing browser cache, credentials gets erased.
So we have made project's source code available