Which backup type copies only files that have changed or been created since the last backup?

Which backup type copies only files that have changed or been created since the last backup?

• A. Full backup
• B. Differential backup
• C. Incremental backup
• D. Mirror backup

Answer: (C)

Incremental backups copy only the files that have changed or been created since the last backup. After an initial full backup, each subsequent backup includes just the new or modified files since the previous backup, keeping backup size and time small. For example, a full backup on Sunday, then backups on Monday and Tuesday would only store changes from Monday and Tuesday respectively, rather than all files again. This approach saves storage and speeds up backups, but restoring requires the full backup plus every incremental backup since then. In contrast, a full backup copies everything each time, a differential backup copies all changes since the last full backup, and a mirror backup is an exact copy of the source at a moment in time.

Incremental backups copy only the files that have changed or been created since the last backup. After an initial full backup, each subsequent backup includes just the new or modified files since the previous backup, keeping backup size and time small. For example, a full backup on Sunday, then backups on Monday and Tuesday would only store changes from Monday and Tuesday respectively, rather than all files again. This approach saves storage and speeds up backups, but restoring requires the full backup plus every incremental backup since then. In contrast, a full backup copies everything each time, a differential backup copies all changes since the last full backup, and a mirror backup is an exact copy of the source at a moment in time.