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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I've seen LibrePhotos mentioned here (https://www.reddit.com/r/selfhosted/comments/npoxm4/librephotos_a_fork_of_ownphotos_with_video_support/) and think that this + GooglePhotos backup script (e.g. https://github.com/JakeWharton/docker-gphotos-sync) could do the trick.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.