And that's comparing to S3 Standard. Infrequent Access is 2x cheaper than that, and Glacier Instant Retrieval 6x (if your files aren't tiny).
I could imagine purchasing that software for a one–time price, running it myself, and paying AWS for storage. But then I’d have to monitor it, troubleshoot outages, maintain things, etc, etc. Or I could pay someone else to do all of that. I’m not currently a customer, but I know which I prefer.
> But then I’d have to monitor it, troubleshoot outages, maintain things, etc, etc.
None of these solutions free you from having to monitor your backups, including Tarsnap. Tarnsap requires setup on your server. You have to make sure it's running and backing up the correct files. And you really should verify you can restore a backup.
I'm really not sure what Tarsnap adds over these aside from saving you from having to sign up for B2 to S3 and punching in an API key.
Tarsnap does full deduplication across all backups for any given "machine", while still letting you independently remove any snapshots you like. i.e. no special "full snapshot" that must always be kept around, and no need for multiple full snapshots that have no deduplication between them.
