I don't see why this should be integrated into PhotoPrism specifically. This seems out of scope, as then you might ask why not add support for uploading to service X, or via protocol Y.

There seem to be a bunch of tools around on github that allow uploading to google photos. The only question would be whether these tools allow incremental uploads, i.e. check which files already exist remotely. If so, set up a cronjob or similar, to trigger an upload once a day.

That being said, I'm not sure Google Photos is a good backup solution in general. Yes it's free, but AFAIK, if you download your files again, some EXIF Data gets stripped, and videos might get transcoded to a lower bitrate.

I understand what you say but as PP is running in a podman container getting a script in there is a bit like working with a Pandora's box for me ( ok still not a PP problem).
Having an import script function would be nice as well but that is not this feature requests.

And like I said getting an export to Google photos is a request maybe not granted but if you don't ask you don't get an answer

I understand what you say but as PP is running in a podman container getting a script in there is a bit like working with a Pandora's box for me ( ok still not a PP problem).

But surely you're mounting an external directory into the container for persistent storage of your photos? Can't you just set up the backup script outside the container? Either on the host machine directly, or add another container that also bind-mounts the originals directory and is responsible just for the backups.

It's mounted through OMV so basically I didn't have to do any real setup. And a share photos is shared with photoprism.
Having a second look at the "plugin" I gues the optional application data could be use. But then it's still a big questionmark how to do a export for everything newly uploaded to PP

I agree. My scenario is I don't use GP for backup, but I have multiple Google TVs that show specific GP albums as screensavers. I want to create an album in PhotoPrism, sync it to GP to display on my TVs so only selected photos are shown.