In shared hosting, multiple websites share resources on a single physical server. This can lead to limitations in handling sudden spikes in traffic or resource demands since all sites draw from the same pool of storage, RAM, and CPU.

On the flip side, cloud hosting provides a more scalable and resilient environment. It utilizes virtualization, separating resources into scalable instances. For instance, CEPH storage clusters ensure redundancy by storing data across multiple instances (3N redundancy), allowing for continued service even if one instance encounters an issue.

In essence, ResellerClub provides weekly backups for disaster recovery purposes. While they offer a service to restore web, email, and database content upon request (for a fee and subject to availability), they strongly advise users not to solely depend on their backups for content safety. Instead, they encourage users to take full responsibility for their own backups.

Load balancing distributes incoming traffic across multiple servers to ensure optimal resource utilization and prevent any single server from being overloaded. This improves performance and reliability.

Redundancy ensures high availability and fault tolerance by duplicating critical components or data across multiple servers or data centers. This helps maintain service continuity in case of hardware failures or other issues.