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When protecting data in the cloud, the selection of a backup approach comes down to an organization's individual needs and the nature of the backup.
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Data loss events take many different forms. When an organization backs up cloud data, it isn't just protecting that data against accidental erasure or modification, but against a cloud-level failure. As such, cloud-to-cloud backups that create a secondary copy of data in the same cloud do not protect against cloud-level failure. The only good backup options involve on-premises backup to the local data center or backing up data to a different cloud.
Assuming all the resources discussed are reasonably reliable, the discussion concerning which approach is better comes down to cost. Regardless of which backup method is used, the cloud provider hosting your data will bill you for the storage I/O created by the backup process and the network bandwidth consumed. Those can be treated as fixed costs.
If you choose to back up data to another cloud, you will incur costs related to storage consumption, storage I/O and bandwidth consumption related to the backup process and backup storage. If the data is backed up to your local data center, you may incur WAN bandwidth costs (if a metered connection is used) and there will be storage, maintenance, power and cooling costs to consider.
Some organizations prefer to back up cloud data to an on-premises target because it makes the data more tangible. There is a copy of the data stored within the local data center, where it is easily accessible. On the other hand, cloud-to-cloud backups allow you to complete the backup process without consuming any of your own WAN bandwidth, so that may be a consideration for organizations coping with bandwidth shortages.
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