I'm trialing a NAS with Immich, and then backing up the media and Immich DB dump daily to AWS S3 Deep Archive. It has Android and iOS apps, and enough of the feature set of Google Photos to keep me happy.

You can also store photos/scans on desktops in the same NAS and make sure Immich is picking them up (and then the backup script will catch them if they get imported to Immich). For an HN user it's pretty straight-forward to set up.