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bandcamp-collection-downloader
A command-line tool to automatically download all releases purchased with a Bandcamp account. The official page of the project is https://framagit.org/Ezwen/bandcamp-collection-downloader, while here this is just a mirror hosted on Github.
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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 had the same question, and found that this script (https://github.com/Ezwen/bandcamp-collection-downloader) is the most reliable, functional way to download a whole library all at once, in the desired format. There are a couple other downloaders I've found that had a GUI, but were unreliable, and didn't work correctly.