Great "Cloud Preservation" cost comparison table in DSHR's latest blog post about archival storage (https://blog.dshr.org/2025/03/archival-storage.html).
Upload/ingest costs are basically a non-factor, but getting your 1 petabyte of data back from Amazon Glacier ($49,550) costs as much as hosting that 1 peta for about 5 years ($10,900 per year)