Backup & Disaster Recovery Flashcards

Which dd command correctly creates a raw disk image of /dev/sda to a file called disk.img?

Answer: dd if=/dev/sda of=disk.img

dd reads from 'if' (input file) and writes to 'of' (output file); if=/dev/sda of=disk.img creates a byte-for-byte image of the disk.

What does RTO stand for in disaster recovery planning?

Answer: Recovery Time Objective

RTO (Recovery Time Objective) is the maximum acceptable time to restore a system or service after a disaster.

What does RPO stand for in disaster recovery planning?

Answer: Recovery Point Objective

RPO (Recovery Point Objective) defines the maximum acceptable amount of data loss measured in time — how old the most recent backup can be.

Which Bacula daemon runs on the backup client and is responsible for reading/writing data on the client system?

Answer: bacula-fd (File Daemon)

The Bacula File Daemon (bacula-fd) runs on each client and handles local file I/O during backup and restore operations.

A sysadmin wants to verify a backup tape is readable without fully restoring it. Which tar option lists archive contents without extraction?

Answer: -t

tar -t (--list) reads the archive and displays its contents without extracting any files, useful for verifying tape readability.

Which feature of LVM is commonly used to enable consistent online backups of a running system?

Answer: LVM snapshots

LVM snapshots create a point-in-time copy of a logical volume that can be backed up while the source volume remains online and in use.

What is the 3-2-1 backup rule?

Answer: 3 copies of data, on 2 different media types, with 1 offsite copy

The 3-2-1 rule is a best practice: keep 3 total copies of data, stored on 2 different media types, with at least 1 copy stored offsite.