Ultimate goal is to backup dandiarchive (currently about 800TB but grows) to NESE tapes. NESE tapes service expects transfer via globus and

Files stored on NESE Tape should ideally be between 1 GiB and 1 TiB. Please consider creating tarballs of these target sizes before sending data via Globus to NESE Tape.

All our dandisets range in sizes of their files from KBs to GBs, and already present in git/git-annex'es at e.g. https://github.com/dandisets . Previously, we abused Dropbox via an rclone shared special remote, but that one is gone now. So I wonder what could be our setup here to most seamlessly and "automatically" batch archive across a range of git/git-annex repos into the same "shared" globus space tarballs.

Any ideas on the setup would be appreciated.