Thanks! I suspect that for my use case (actual backup no meed for cloud access) s3 glacier is statistically cheaper.
How do you test your backups? You do test your backups, right? Your other comment mentions using dropbox, but that's hardly a real backup solution, and you could easily run into a situation where you need to retrieve files beyond the 30 day window.
And it’s such a good thing to remind people of. You don’t manage a backup service. Nobody cares about backups.
People care about restores.
I would personally be fine running tests on data that is recently backed up and only testing the data in glacier once or twice. Think about why you test backups in the first place—the main errors you’re trying to catch are problems like misconfiguration, backups not getting scheduled or not running, or not having access to your encryption keys. You can put your most recent backup in “infrequent access” and let older objects age out to glacier with lifecycle rules.
Glacier used to have really expensive retrieval costs. That’s now called “glacier deep archive” and as far as I know, major use cases are things like corporate recordkeeping / compliance (e.g. Sarbanes-Oxley). The costumers for deep archive should be sophisticated customers.