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Data Backup

Unit 10. Data Backup. 10.4. Types of Storage 10.5. Features of a Good Backup Strategy. 10.1. Data Backup 10.2. Types of Backup 10.3. Backup Procedures. Table of Contents. Data Backup. Overview. kTip: Backup.

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Data Backup

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  1. Unit 10 Data Backup

  2. 10.4. Types of Storage 10.5. Features of a Good Backup Strategy 10.1. Data Backup 10.2. Types of Backup 10.3. Backup Procedures Table of Contents

  3. Data Backup Overview

  4. kTip: Backup Backup is the activity of copying files or databases so that they will be preserved in case of equipment failure or other catastrophe.

  5. kTip: Restoring files The retrieval of files you backed up is called restoring them.

  6. Purpose 0f Data Backup All electronic information considered of institutional value should be copied onto secure storage media on a regular basis (i.e., backed up), for disaster recovery and business resumption.

  7. Purpose 0f Data Backup Backup provisions allow processes to be resumed in a reasonable amount of time with minimal loss of data.

  8. 10.2 Types of Data Backup

  9. Takeaway from this topic Learn about full backups, incremental and differential backups, and newer types of backups like mirror and offsite backups. This will help in choosing the best data backup type for your organization's data.

  10. 10.2.1 Full Backup

  11. Full backup Full backup is a method of backup where all the files and folders selected for the backup will be backed up. Simply put, It is a full copy of your entire data set.

  12. Full Backup - Usage It is commonly used as an initial or first backup followed with subsequent incremental or differential backups. After several incremental or differential backups, it is common to start over with a fresh full backup again.

  13. Full Backup - Usage Some also like to do full backups for all backup runs; typically for smaller folders or projects that do not occupy too much storage space.

  14. Full backup - Advantages Restores are fast and easy to manageas the entire list of files and folders are in one backup set. Easy to maintain and restore different versions.

  15. Full backup -Disadvantages Backups can take too much time as each file is backed up again every time the full backup is run.

  16. Full backup -Disadvantages Consumes the most storage space compared to incremental and differential backups.

  17. Full backup -Disadvantages The exact same files are be stored repeatedly resulting in inefficient use of storage.

  18. 10.2.2. Incremental Backups

  19. Incremental backup Because full backups are so time consuming, incremental backups were introduced as a way of decreasing the amount of time that it takes to do a backup. Incremental backups only backup the data that has changed since the previous backup.

  20. Incremental backup With incremental backups, one full backup is done first and subsequent backup runs are just the changed files and new files added since the last backup.

  21. For example, suppose that you created a full backup on Monday, and used incremental backups for the rest of the week.

  22. Tuesday's backup would only contain the data that has changed since Monday. Wednesday's backup would only contain the data that has changed since Tuesday. And so on...

  23. Incremental backup - Advantages Much faster backups.

  24. Incremental backup - Advantages Efficient use of storage space as files are not duplicated. Much less storage space is used compared to running full backups and even differential backups.

  25. Incremental backup - Disadvantages Incremental backups can be time-consuming to restore.

  26. Incremental backup - Disadvantages Restores are a little more complicated. All backup sets (first full backup and all incremental backups) are needed to perform a restore.

  27. 10.2.3

  28. Differential backups(***clonezilla full pc backup) A differential backup is similar to an incremental backup in that it starts with a full backup, and subsequent backups only contain data that has changed.

  29. Differential vs. Incremental Backup The difference is that while an incremental backup only includes the data that has changed since the previous backup, a differential backup contains all of the data that has changed since the last full backup.

  30. Differential vs. Incremental Backup Suppose for example that you wanted to create a full backup on Monday and differential backups for the rest of the week.

  31. Differential vs. Incremental Backup Tuesday's backup would contain all of the data that has changed since Monday. It would therefore be identical to an incremental backup at this point. On Wednesday, however, the differential backup would backup any data that had changed since Monday.

  32. Differential backups - Advantages Much faster than full backups.

  33. Differential backups - Advantages More efficient use of storage space than full backups since only files changed since the last full backup will be copied on each differential backup run.

  34. Differential backups - Advantages Faster restores than incremental backups.

  35. Differential backups - Disadvantages Differential backups are slower then incremental backups.

  36. Differential backups - Disadvantages As time progresses, a differential backup storage can grow to contain much more data than an incremental backup. In such a case, the storage may not be sufficient.

  37. Differential backups - Disadvantages Restores are slower than with full backups.

  38. Differential backups - Disadvantages Restores are also more complicated than full backups but simpler than incremental backups. Only the full backup set and the last differential backup are needed to perform a restore.

  39. 10.2.4. Mirror backups

  40. Mirror backups A mirror backup is a straight copy of the selected folders and files at a given instant in time.

  41. Mirror backups Mirror backup is the fastest backup method because it copies files and folders to the destination without any compression.

  42. However, there’s a catch.

  43. Caution With mirror backups, when a file in the source is deleted, the file is eventually also deleted in the mirror backup. Because of this, mirror backups should be used with caution.

  44. 30 day delete To tackle an issue like the files being deleted, many online backup services offer a mirror backup with a 30 day delete.

  45. 30 day delete This means that even when you delete a file on your source, that file is kept on the storage server for at least 30 days before it is eventually deleted.

  46. What’s the point of this 30 day delete?

  47. 30 day delete 30 day delete helps strike a balance offering a level of safety while not allowing the backups to keep growing since online storage can be relatively expensive. The functionality is similar to the Google Drive offline sync option.

  48. Mirror backups - Advantages The backup is clean and does not contain old and obsolete files.

  49. Mirror backups - Disadvantages There is a chance that files in the source get deleted accidentally, by sabotage or through a virus may also be deleted from the backup mirror.

  50. 10.2.5 Full Pc Backup

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