I am migrating to Nextcloud memories and move away from Google photos however my previous phones and family are linked to the Google account is there a way to compare all the photos on my local gallery to my Google photos to make sure I have downloaded all the photos from there I don’t have time to download everything from Google photos and delete duplicates


If you’re looking for a more sure fire way, don’t use the app/your phone. Go to Google takeout and download all your contents from Photos onto your computer - if you have access to one. They come in zip files, which you can then unpack and store everything on your nextcloud server.
Edit: important info in the replies below.