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Long-term archival / storage is not the use case for S3, that'd be more Glacier or B2's thing.

The storage itself is competitive with Hetzner's storage solutions (nextcloud or storage box), though you'd pay for traffic on top of that.

Glacier is wonderful. I am able to store basically everything I want and it costs me less than $1/mo

The cost in glacier is if you ever need to retrieve data

Right which is free for the first 10GB each month and then is $0.01 per GB after that for standard retrieval.