This is likely very paranoid behaviour but I recommend downloading all your Google data from time to time: takeout.google.com
Exporting my Google Photos sometimes fails consistently even with lots of attempts. Out of well over 10 export attempts or so this year maybe a single one succeeded. I have a few hundred GB of data stored on that account. I also currently have a support ticket with Google open on that issue, but after initial follow-ups haven't received a response in a couple of months now.
That said my current approach for backing up things is to upload an "age" encrypted version of the data from Google Takeout to Wasabi. Once uploaded I run a script that shows me the diff between the data sets (so that I can ensure that no old data went missing that shouldn't have gone missing) before I delete older data. Probably not the most optimal approach though. Might be better to just set up some versioning layer on top of Wasabi and to keep deleted or modified data forever.