Earlier quoted context omitted.
* S3 is super expensive, unless you use Glacier, but that has a high overhead per file, so you should bundle them before uploading. * If your value your privacy, you need to encrypt the files on the client before uploading. * You need to keep multiple revisions of each file, and manage their lifecycle. Unless you're fine with losing any data that was overwritten at the time of the most recent backup. * You need to de…
Even with Glacier, S3 is ridiculously expensive compared to almost anything else.
As with anything, there are tradeoffs. There are situations where S3 is cheaper. For my use case (long term storage, rarely downloaded), Glacier Deep Archive is about $1/TB/mo which is cheaper than anything else out there (rsync.net, Backblaze R2, Cloudflare R3, Wasabi). Where you get bitten by Glacier is if you need frequent access since you pay a fee for AWS to retrieve the file in addition to the bandwidth used to download it.