One of the challenges with TCO comparisons is that there are many variables that one can model, each bringing different degrees of influence to the result. No two customers are ever alike. But if one considers just the primary cost of storing and retrieving data using a service like Azure, then within five years, accessing a small percentage of archive data on a regular basis - let’s say 3% of 200 TB - will cumulatively be more costly than accessing it from tape, assuming the archive grows at a typical 40% CAGR.
In the example above, the cumulative cost of storing and retrieving that 3% of data using the public cloud is more than $100k across five years. In comparison, an HPE StoreEver MSL6480 tape library using LTO-7 with 1 PB of storage will cost half that amount. And this takes into account ancillary tape costs like offsite vaulting and IT headcount to manage the process in-house instead of outsourcing.
In reality, however, 3% is a pretty conservative estimate since many customers require far higher percentages of data to be retrieved frequently. The gap is even wider if one increases the retrieval rate to a mere 5%. And obviously, the greater the volume of data, the greater the cost of retrieving it will become. Consider that 200 TB today will be over 1 PB in six years’ time, and 4 PB in ten years if it grows at 40% CAGR.
A recent study by analysts, ESG, found that almost half of respondents continued to leverage tape for long-term storage. Perhaps the reason for this is that ESG’s independent analysis estimated that an LTO-8 tape solution could offer an expected cost of ownership 66% lower than an all-cloud alternative over a ten year period.
“Over an extended period, LTO technology offers a reliable and cost-effective data retention solution compared with current generations of all-disk and all-cloud storage solutions. The latest generation, LTO-8, offers the reliability that organizations expect from tape media, while offering increased capacity and performance at a lower price per TB.” ESG, Quantifying the Economic Benefits of LTO-8 Technology
In summary, customers who intend to put all of their archive data into some kind of public cloud would be well advised to model the TCO for different retrieval rates based not just on the data they hold today, but the data they expect to have in the future. In most cases, they will find that tape remains far and away the most cost effective solution for the long term storage and retrieval of the infrequently accessed, unstructured information that eventually constitutes about 60% of total business data.