Note that, in the event of retrieval, it's not just per GB, it's also per request.<p>Synology has offered Amazon Glacier and S3 as a destination option with Hyper Backup for years as part of their NAS offerings. Given the available automatic archive feature to move an existing store to Glacier Deep Archive, budget permitting I'd recommend a NAS over this for three reasons:<p>- Initial setup costs aside, the power draw of a two bay unit like the DS218 (15W at load) would be ~$16/year at peak usage assuming a cost of $0.12/W<p>- Uploading/syncing your local files to your NAS should be considerably faster, technically 'free', and can be done more frequently as you desire; should you need them, it would also be 'free' to retrieve them locally barring a catastrophic event<p>- The remote push of the NAS contents to S3/Glacier storage can be done asynchronously of your PC's state (and, to save money, less frequent if you wish), which as you point out could take days; additionally, you can save money given you can reduce the number of requests via automatic archiving/compression<p>Given how unlikely it is for you to retrieve data from Glacier Deep Archive with such a setup, I highly recommend it. You can still rest knowing your data is offsite.