What is data backup?

Data backup creates and preserves separate copies for recovery after loss or corruption. Hardware failure, accidental deletion, ransomware and lost account access are different risks. A backup fulfils its purpose only when the required information can actually be restored.

How do full backups, incremental backups and synchronization differ?

A full backup includes the selected dataset, while an incremental backup captures changes since a relevant earlier point. Required restoration copies depend on the method. Synchronization keeps locations aligned, so deletions or corruption can propagate. Version history and retention therefore matter. Another folder on the same drive provides no independent protection against drive failure. Copies on different media and in separate locations, including an offline or modification-resistant layer, can distribute risk.

How should restoration be tested?

Backup frequency depends on acceptable data loss and recovery time. Plans should cover configuration, application data and encryption keys as well as documents. Test recovery in a separate environment and confirm that files open and applications run. Restrict access to backups and protect sensitive information. If one account can delete every copy, account compromise has a larger impact. A successful job notification alone is insufficient: recovery tests, logs and retention need ongoing review.