Pour one out for Google+, the latest Google social property to be axes. There aren't many people who care about saving their story on Google+ ̵1; it's part of why it's dying! – But if you want yours, this is how you get it.
Google's "Takeout" page is your friend here. Go to this link and select one or more of the four categories for Google+ data. + 1s is a list of all the websites you have pressed the little red button on, much like Facebook's "likes." Circles are your friends and contacts on Google+, the community is the groups you joined and their posts and Google+ Stream are all your personal posts, +1 on the site, and comments on other users' posts.
Note the downward arrow in each of these sections: Each has options for just downloading certain posts from specific communities or changing download formats. Most of the time HTML is what you want, but if you import into a program that supports more complex files, JSON and CSV are also supported.
Click "Next" to go to the next page. You can download data in ZIP or TSV archive format. The File Size option lets you split it into multiple downloads if it's too big for just one.
The "Delivery method" field is particularly noted. Google's Take-Out system will send you links to your Gmail address by default, where you can download each archive individually. But you can also import them directly to Google Drive, or sign in to Dropbox, Microsoft OneDrive or Box.com to add them to these services instead.
When you're ready to continue, click "Create Archive." (The button is "Link Account and Create Archive" if you are using a non-Google service.) You will receive an email when your links are ready, or if you use a cloud service, the ZIP or TSV files will be loaded on the cloud within short. That's it: you can aim through all these posts at your leisure.
Google+ will be shut down on April 2, 2019 and all user data on Google's servers will be gone. You have until then to get it somewhere safe.