This! OP is asking the right questions, but making a copy of your passwords does not cut it. Find a place to backup ALL your important data (that will be accessible when the house burns down).

This post should be in the dictionary under Chesterton’s fence.

So use whatever you were using before and add that as an external library to immich?

https://immich.app/docs/features/libraries

Don’t have any personal experience, but https://awesome-selfhosted.net/tags/inventory-management.html seems like a good starting point.