Quantify "0.07%". While it looks a small number it could be quite significant if we knew what value the percentage was of.
Amazon says that about 0.07 per cent of the EBS storage volumes in the East Region of its infrastructure cloud are not "fully recoverable" following the extended outage that hit the service last Thursday. The company has yet to fully explain the cause of the outage, but it still plans to publish a "post mortem" on the incident …
It could be that they do take good backups, but the lost data is since the last backup.
I don't know the RTO or the RPO for the Amazon cloud, so it could be that a certain amount of transaction/data loss is to be expected. Zero transaction loss systems are typically only found in institutions like Banks and then only for payments systems, they are very, very expensive indeed.
The other option is that they've had a failed backup and won't be able to recover the data except from the pervious backup. However this could turn out to be them having had a long time failing backup, in which case they need to be avoided.
Ask anyone who works in backup and recovery or storage in general and they'll tell you that in a large enviornment you always get backup faliures from time-to-time.
Given Amazons cloud history, along with it's peremptory transactions with Wikileaks, it is obvious the service is not ready for prime time.
Obviously Amazon can't provide reliable back-up, the need for clients to secure their own data remains effective.
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