- Nothing is eternal, source code (in all forms) disappears
- Hopefully, SWH keeps a copy of everything
- Since November 2018, [[https://www.softwareheritage.org/2019/04/18/software-heritage-and-gnu-guix-join-forces-to-enable-long-term-reproducibility/][Guix ensures source code is archived in SWH when building]]
- After source code actually disappears, falls back to SWH when rebuilding
** Reproducibility is of the essence!
*** Report
- Tarballs will disappear (give it enough time)
- Persistent intrinsic identifiers (SWHID) are not (yet?) package manager standard