Many users prefer keeping a local backup of important Gmail messages for offline use.
ConverterTools Gmail Converter makes this process simple by offering an easy email backup solution. You can also select specific folders like Inbox, Sent Items, or custom labels before downloading the backup. The software allows you to export Gmail to MBOX, making emails accessible in supported applications. Additionally, it keeps email metadata like To, From, Date, and Subject safe during export.

For more: https://www.convertertools.org/blog/export-gmail-to-mbox-file/