Backup strategy

Backup strategy:
In computer world most important thing is DATA. No system can 100% secure or fault tolerance, so we always worry & care about data.
Various organization follows different back strategy. Like daily, weekly, monthly or yearly and at different levels.
Once my CEO asked me to design the backup system, and then I study various backup system, algorithms and architectures.

Then I come up with this backup architecture

Level 0 - Hard disk backup using RAID -1 mirroring, its purpose is to use in the case of hardware failure.

Level 1 – OS backup using rsnapshot. It is a file system backup utility based on rsyn, using rsnapshot; it is possible to take snapshots of your file systems at different points in time. Its purpose is to use in the case of OS failure.

Level 2 – Application data backup on same data center using Rsync. Its purpose is to use in the case of application failure.

Level 3 – Application data backup at remote location. Its purpose is to use in the case of data center failure.

As you move from level – 0 to level -3, you have to take more revisions like hours 1, day 1, week 1, and year.

I think this is quit good backup strategy.