Longterm storage: NAS + HDDs + CrashPlan Unlimited (for ARM devices) vs. costly Amazon Glacier [cost analysis]
OK, it's not really fair to call Amazon Glacier “costly”. However, it might not be your cheapest option for storing a few terabytes of data for a few years (or more)....
For large-volume data storage with a target lifespan of 2 years or less, Glacier can be a great option. It costs just $0.01/GB per month at this time of writing. — The costs can definitely add up, though. To store 2TB (2,000GB) it would cost $240/year, and there's no longterm discount currently. While they may drop their prices at some point, the current costs are still too high for most consumers needing to store more than a few hundred gigabytes longterm.
- If you're storing a few hundred GB, then chances are a NAS is not worth the cost to you.
- If you're storing a lot more than that, to get the best of both worlds, the best option for this is to get a network-attached storage device (NAS) and back that up to CrashPlan for $60/year unlimited instead of paying Amazon $0.01/GB every month.
A NAS is a box of hard-drives with a lightweight computer embedded to ideally mirror your data across multiple drives (using RAID technology) for redundancy in the event of one or more drives failing. It can run some basic software (such as CrashPlan for offsite backups, or BitTorrent Sync for your own secure Dropbox-like syncing folders), and also, if a drive has a failure, can recreate that drive's data onto a freshly inserted drive using the data already sharded across the other drives that are still operating. Cool, huh?
The case for Glacier
Cost: $0.01/GB per month ($120/year per TB, 1000GB)
If you're storing data for less than 2-3 years, or not very much data at all, then Glacier is probably going to be cheaper. If you're archiving lots of photos, videos, or other large files, you'd most likely want to invest in a NAS and back that up to CrashPlan as your cloud storage option. — If you already own a NAS, then there's no need for Glacier unless your new data is too large for the NAS's existing storage configuration. (but you could also expand that by buying larger drives!)
It's possible that Amazon Glacier could drop significantly in price in the future. Storage technology keeps getting cheaper and more efficient, and people are already questioning how Glacier is able to operate at such a low cost. Some speculate that they are using the offline cold-storage of optical media (BDXL).
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