Hope you are well,
I’m not sure this will help but this is how I exported my blog ages ago . It was however smaller.
“- Once you’re logged in, go to the My Site tab and then click on WP Admin.
-Now we’re inside the WordPress Dashboard, let’s find the Tools tab and the Export option within
-. Inside, you’ll see two options. One for the regular Export and a second for a Guided Transfer process, which we will talk about later. For now, just click on Start Export.
-On the following page, you’ll be asked exactly which content you want to export, so you can choose what exactly you’ll export . then proceed to click on Download Export File.
P.s One final warning: If your export file happens to exceed the 32mb threshold (in which case, you probably have been spending too much time on WordPress), you’re going to run into problems during the next few steps due to a limit on the size of files that can be imported into your new WordPress install. In that case, you’ll need to use a WXR WXR file splitter to split that file into more manageable pieces. It’s unlikely this will occur to you, but we consider it our duty to warn you nonetheless – we’re just great like that”
– hope this is what you where looking for !