Does Immich support read-only source folders yet? I'd like to keep the original files intact, but allow Immich to index them.

Yes, at least for a year. There is a ”external library” feature, I think that does what you want.

Thank you! That was not available the last time I checked.

It's been available for nearly three years

Yes, using external libraries. It's been a feature for several years. Make it read-only by mounting docker compose read only

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