Arq can back up to either Amazon S3 (Simple Storage Service) or Amazon Glacier.
Amazon S3 (Simple Storage Service) is the gold standard of online storage, backed by Amazon.com, Inc, a $100B company. S3 offers 99.999999999% durability of your data. It’s designed to withstand the concurrent loss of 2 data centers without losing your data.
Amazon Glacier is an extremely low-cost storage service. It offers the same 99.999999999% durability. In order to keep costs low, Amazon Glacier is optimized for data that is infrequently accessed. Initiating retrieval from Glacier typically takes 3-5 hours, and Amazon charges for retrieving large amounts of data from Glacier.
Choose S3 for fast access, or Glacier for low cost. Or mix and match, backing up some folders to S3 and others to Glacier.