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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
You could use Restic (https://restic.net/). You would create restic repo on HDD_0 and then backup to it all the other drives. Restic will do dedup. Checkout the quickstarts on their website.
Another cool tool to do deduplication is rdfind (https://github.com/pauldreik/rdfind). You could keep running it each time after you copy files from another device.
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.