Module 10: Data Protection (Data Deduplication + Data Archiving)

Question 1

What are the cons of duplicate data?

Answer 1

impacts backup windows
increases network bandwidth
difficult to protect data within budget

Question 2

What is data deduplication?

Answer 2

process of detecting and identifying the unique data segments within a given set of data to eliminate redundancy

Question 3

What is the deduplication ratio?

Answer 3

ratio of data before deduplication to the amount of data after deduplication

Question 4

What are the key benefits of data deduplication?

Answer 4

reduces infrastructure costs
enable longer retention periods
reduces backup windows
reduces network bandwidth

Question 5

What is source based deduplication?

Answer 5

data is deduplicated at the source (backup client)

Question 6

When is source based deduplication recommended?

Answer 6

ROBO environments

also commonly used by cloud service providers

Question 7

What are the advantages of source based deduplication?

Answer 7

reduces storage capacity and network bandwidth requirements

Question 8

What is target based deduplication?

Answer 8

data is deduplicated at the target (inline vs postprocess)

Question 9

What are the advantages and disadvantages of target based deduplication?

Answer 9

offloads backup client from deduplication process

requires sufficient network bandwidth

Question 10

What is a disadvantage of source base deduplication?

Answer 10

puts more burden on the host since its responsible for generating safe set and deduping

Question 11

What does inline deduplication mean?

Answer 11

dedupes in cache and than send to disk

Question 12

What is file based dedupe?

Answer 12

takes full backups of a file and can dedupe it to reduce copies - but if any part of file changes need to do another backup

Question 13

What is sub-file based dedupe?

Answer 13

when you generate a file the first day it breaks it down into sub-file/objects

Question 14

What is data archiving?

Answer 14

moves fixed content that is no longer actively accessed to a separate low cost archive storage system

Question 15

What are the advantages of data archiving?

Answer 15

saves primary storage capacity

reduces backup window and backup storage costs

Question 16

What is a data archive?

Answer 16

primary copy of data
available for data retrieval without recovery
typically long term retention

Question 17

What is the difference between data archive and data backup?

Answer 17

secondary copy of data
used for data recovery operations
typically short term retention

Question 18

What are the components of data archiving?

Answer 18

archiving agent
archiving server (policy engine)
archive storage

Question 19

What does the archiving agent do?

Answer 19

scans primary storage to find files that meet archiving policy

Question 20

What is the archive server?

Answer 20

indexes the files

Question 21

What is a small stub file?

Answer 21

contains the addess of the archived file and stays on the primary storage - small in size/capacity