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fdupes
FDUPES is a program for identifying or deleting duplicate files residing within specified directories.
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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 would add the content of your current drives with rysnc to the new big drive. I would then run https://github.com/adrianlopezroche/fdupes To remove duplicate files.
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