4e9fe054_Implementing_a_backup_strategy_able_1___BACKUP_DEVICE_OPTIONS_Target_backup_device
[Advantages] Easy Very fast Files not lost if master drive crashes or becomes unbootable Drive containing backup can be disconnected easily so that it is then completely isolated from possibility of infection by malware Drive can be stored in a safe location or off-site Might be possible to boot the PC directly from the drive in the eSATA enclosure. [Disadvantages] Cost of hardware lf the enclosure is fan-ventilated it could be a tad noisy (7) (but in my view, having a fan in the enclosure is essential if the enclosure is used for more than 30 minutes at a time) [Target backup device] 
Drive in an external enclosure that has an eSATA interface to the PC
Implementing a backup strategy
Target backup device