Statement 1: If possible it is always advised to make only Full Backups Statement 2: LAN free backups typically run slower than LAN based backups.

Statement 1: Virtual Tape Libraries allow for a highly scalable backup strategy as storage can be added later.
Statement 2: Virtual Tape Libraries should be used when remote datacenters are NOT available.

Statement 1: LAN based backup strategies are preferred as they are the most cost efficient method and offer the highest performance.
Statement 2: Any backup strategy should provide in storing production data and backup data in different physical locations.

Regarding the benefits and necessity of enterprises doing disaster recovery system construction, is the following statement wrong?

When the hard disk has bad sectors or blocks, which reconstruction method is used?