Is it always possible to restore the system to its original state after a failure or changes?

Restoring the system to its original state after a failure or changes is not always possible. It depends on several factors:

• Availability of backups: if current and correct backups are available, you can revert to them.
• Type and scale of changes: some changes may be irreversible (for example, data deletion without backups).
• System complexity: in distributed systems with many components, recovery can be difficult.
• Rollback mechanisms: if the system supports transactions, version control, or logging, recovery is easier.

In practice, strategies such as backup, logging, and monitoring are often used to minimize the risk of data loss and ensure recovery options. However, 100% recovery cannot be guaranteed, especially in cases of hardware failures, human errors, or critical software defects.