If you are searching for a method to backup Gmail mailbox data, you can try the Sysinfo Gmail Backup Tool. This Tool is a comprehensive software solution designed to securely backup Gmail data, including emails, contacts, calendars, and Google Drive files, to various local file formats (e.g., PST, MBOX, PDF, EML) or directly migrate them to other email clients (e.g., Office 365, Yahoo, Thunderbird). Key features include selective backup via date filters and folder selection, options to remove duplicate emails, manage attachments, and “free up server space” by deleting emails after backup. It maintains folder hierarchy and is available for both Windows and Mac operating systems, often with a free demo for evaluation.
To back up your Gmail mailbox, you can use several reliable tools. Google Takeout is the official method, allowing you to export your entire mailbox in .mbox format.
If you have lots of data and want to do it effortlessly, you can consider some third-party tools.
Note: Before buying any tool, you have to do your research to avoid fraud.