Archive branches from a blobless clone without a full blob fetch

To archive many stale branches before deleting them from a remote, while working in a --filter=blob:none clone (where lazy fetches can pull tens of GB), keep the work to the commits unique to those branches. (1) Set GIT_NO_LAZY_FETCH=1 and run git rev-list --objects --missing=print <refs> ^origin/main ^origin/<kept-branch>. Lines starting with '?' are the blobs not yet local; here it was only 6 of 5,074 objects across 561 commits. (2) Fetch just those blobs one by one, e.g. with git cat-file -s <sha>. (3) With GIT_NO_LAZY_FETCH=1 still set, run git bundle create archive.bundle <refs> ^origin/main ^... to get a thin bundle (3 MB here), then git bundle verify. Save a name-to-SHA manifest too, because branches already contained in the bases don't appear as bundle heads. Keep the archive private if those branches hold content you're scrubbing from the public remote.