Amazon have announced their Glacier storage system that competes with traditional off-line storage such as tapes. Storage can cost as little as $0.01 per MB per month (so about $10 per TB) and though archival is relatively quick, retrieval can take 4 or 5 hours. Amazon expect users to utilise their notification service so that retrieval jobs are run in the background and users will be notified when the job has been completed. This should be extremely compelling for companies who want to archive data but don't want to invest in network attached storage or slow tape backup solutions. Users should note other charges will be added such as data transfer charges (which can quickly add up).