This simple Gmail trick gave me another 15GB of storage for free - and I didn't lose any files
Briefly

The generous 15GB of storage Google offers with new accounts can fill up quickly, especially due to videos and pictures stored in Google Drive and Photos.
To save space and avoid the pain of manually deleting emails, using Google Takeout is a recommended approach for backing up important emails before starting fresh.
While Google provides a free 15GB of initial storage, options like upgrading to Google One for additional storage are available, but backing up files can be an effective free alternative.
Back up your emails to an external hard drive before cleaning up your inbox. Google Takeout allows you to export your data easily, ensuring you don’t lose important mails.
Read at ZDNET
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