Archive irreplaceable raw data (sequencing runs, imaging, field data) to write-once cloud cold storage — generate checksums, verify before upload, stream a tarball to S3 Deep Archive under Object Lock, and prove the pipeline with a restore test before trusting it at scale. Use when the user asks to back up or archive raw data, set up an immutable/WORM backup, generate md5 checksums for a data folder, or verify/restore an existing archive.