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Notes

Data backup and Recovery

  • Categories Notes, Computer Fundamentals
Data Backup

Q 1. What is backup?

Ans:      

Backup refers to making a copy or archiving of data at a secondary site, which can be used to restore or recover the data in case of failure or loss of original data.

Q 2. Where can we do backups?

    1. External hard drive or USB flash drive
    2. CD / DVD or tape drives.
    3. Online backups such as on cloud

Q 3. Why do we do backups?

Ans :     

Backup could be done for any of the following reasons.

      1. Media or hardware failure such as hard disk crash etc.
      2. Malware attack such as virus infection leading to file corruption.
      3. Software crash or accidental deletion.
      4. Theft or natural disaster.

Q 4. What are different types of Data Backups.?

Ans:

Full BackupDifferential BackupIncremental Backup
It makes a copy of all data to another set of mediaIt copies only the data that has changed since the last backup operation of any type (Full or last differential).It will copy all data changed since the last full backup
It takes a long time as all data is backed up.It is the fastest as only changed files are copied.The time taken gradually increases after every full backup.
Restore is fastRestore takes longer time.Restore time is fast
Need large storage spaceNeed less storage spaceSpace requirement is moderate

Q 5. What is online backup and what are the advantages of it?

Ans:

Online backup or remote backup, is a method of offsite data storage in which files, folders, or the entire contents of a hard drive are regularly backed up on a remote server or computer with a network connection.

PROS:

      1. Backups are stored in a different location from the original data
      2. The need for maintaining hardware such as servers, tapes etc. are not required.
      3. It does not require much user intervention as backups are automatic.
      4. It is scalable as most of the backup services are pay as you go model

CONS:

      1. It leads to high network traffic especially if there large volume to be backed up.
      2. Restoration of data can be slow over the internet.
      3. There could be privacy concerns

Q 6. What is DRP (Disaster Recovery Plan) how is it different from BCP (Business Continuity Planning)?

Ans:

A disaster recovery plan (DRP) are set of procedures to recover and protect a business IT infrastructure in the event of a disaster.

A business continuity plan provides a blueprint for how operations can continue to function effectively during a loss of resources. A DRP is typically part of business continuity plan.

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