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I have followed this guide a few times to successfully back up on Glacier:

One of the tricky things is making sure that you're not duplicating things you've already backed up. The way I handle it is through a combination of date ranges and tags.

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The article says it costs $.40/mo to store 400GB on Glacier. Looking at current Glacier pricing of $.0036/GB, that should actually be $1.44/mo. I realize an additional $1.04/mo isn't much but the number is off by a factor of 3.6x so I'm just trying to understand. Also, if you're willing to spend a tad more, the 400GB could be stored on Backblaze B2 for $2.4/mo but egress is free!

It depends on the region and which Glacier product you choose. I think your pricing of $0.0036/GB is the cheapest I've seen. However it is for the 'Flexible Retrieval' option. 'The Deep Archive' option is $0.00099 and thus 39.6 cents a month. This rounds up to the $.40 figure provided in the article.

Ah OK, I wasn't aware of the Deep Archive option, it's not on the price list of the main Glacier page but it is linked to. Thanks for the details.

That seems nice! Will try this approach.

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