Install a plugin like "Export Media with Selected Content" to generate a comprehensive zip.
Manually download your wp-content/uploads/ folder via FTP/File Manager and export your SQL database through phpMyAdmin. Download Nksyshh zip
Within Blogger, go to Settings > Manage blog > Back up content to get an XML file. Other Options Install a plugin like "Export Media with Selected
Go to Google Takeout to export Blogger data, which generates a zip file containing Atom feeds and media. Download Nksyshh zip