持续数据保护: 必须为企业拥有关键数据

Few days ago i talked about  “点及时恢复 : 备份解决方案为企业和商业” in which we talked about point in time concept. That particular concept is nearly perfect but it does have a drawback if the enterprise need to recover data that got lost between the two scheduled 备份.

For some enterprises and businesses , losing even a small amount of data is not acceptable because of the critical nature of the data and loss caused by losing even the small data either in terms of money or reputation of the enterprise or business , hence  数据丢失 by any means simply isn’t an option.

因此，whats解决方案. 字母a 在线备份 concept which comes in handy for something like this is widely known as Continous data Protection or CDP in short.. In this article i will talk about in layman terms as much as i can do. As per definition of CDP on wikipedia :

持续数据保护 (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves. It allows the user or administrator to restore data to any point in time.

So what makes it different from scheduled backups or normal backup or point in time backups? If you read the definition above you will know. 持续数据保护 (CDP) technology saves every write/delete operation on harddisk on a file in real time. Its like a real time synchronisation of the actual data and the backup.

Conventional backup methods depend on the scheduled backups to restore data. That means you cannot restore data between the two backups. While with CDP you can specify the exact point of time  at which you want your data to be restored.

With Continuous data protection (CDP), in the event of system being infected either due to virus/Trojan, or if data gets damaged/lost or corrupted and the problem  remains undetected for some time for whatever reasons, it is always possible to recover the most recent clean copy of affected data from the 在线备份 CDP copy.

One of the bottlenecks connected with this technology is full availability of network bandwidth. Any disruption in traffic or network disruption can seriously impair CDP operation. Some companies providing this technology avoid this by resynchronizing the data once the network disruption passes, 但是 data corruption is a serious possibility in that amount of time of disruption.

Many experts point out that CDP  concept of backup needs anywhere from 5% 至 40% additional storage overhead,  which i dont think is too much extra storage space required compared to benifits of the technology.

With these advantages, CDP is used to continuously back up crucial corporate data on file servers and transiently connected machines to minimize the backup/recovery window and maximize the granularity of recoverable data.

I wrote this article in simple terms avoiding technical terms. If you need any clarifications, just leave a comment below and i would be glad to answer you.

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标记为: 备份, CDP, 持续数据保护, Data corruption, 数据恢复, 数据被盗, 远程备份服务, 安全