Hi

Try using Softaken G Suite backup software. A new, cost-effective solution that offers the direct capability of backing up G Suite emails locally or on a cloud service Simply choose the source and enter your login information, and the application will immediately backup every G Suite file without any data loss to the specified file format or cloud server. and it can allow users to save G Suite email backups into PST, EML, MSG, EMLX, and MBOX, among others. Moreover, you may backup your emails using a G Suite account. and it should preserve all elements such as To, To, CC, BCC, and attachments, etc. Both technical and non-technical individuals may utilize the tool because of its self-explanatory user interface. This utility has been designed with a number of advanced features that make converting efficient and completely reliable. 

https://www.softaken.com/google-apps-backup-pro