I wrote my thesis on Overleaf. It gave me peace of mind that it was backed up somewhere other than my computer. I also intermittently downloaded the whole thing as a zip file and dated it in case something happened to the site. I also backed those backups up to time machine on an external. Never had any trouble but maybe read through their EULA just in case there is something funky? Good luck on your PhD!
ETA:
> ...By using our Services, you may provide us with information, files, and folders via our products, services and otherwise (together, “your stuff”). You retain full ownership to your stuff. We don’t claim any ownership to it. These Terms do not grant us any rights to your stuff or intellectual property except for the limited rights that are needed to run the Services, as explained below....
Looks pretty good to me. From here
I wish I knew where I got these, they were in an Instagram ad And there are literally no identifying markings on them lol. I would just say make sure they have removable lenses so you can change the magnification if you need too, and having the LED light built in is really nice.
Edit: found em, they're nice and cheap! Magnifying Glass with Light,Hands Free Headband Magnifying Glass,Headband Magnifier with LED Light Jewelry Craft Watch Hobby 5 Lenses 1.0X 1.5X 2.0X 2.5X 3.5X (Upgraded Version) https://www.amazon.com/dp/B07D12Z2Y2/ref=cm_sw_r_cp_apa_i_EZgaGbG0SSG1N?_encoding=UTF8&psc=1