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Supplement the backup content #2471

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Nov 2, 2024
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Supplement the backup content #2471

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Supplement the backup content
jimcat8 Nov 2, 2024
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Modify the content of the backup method
jimcat8 Nov 2, 2024
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16 changes: 11 additions & 5 deletions docs/books/admin_guide/09-backups.md
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Expand Up @@ -52,7 +52,7 @@ These operations consist of saving information in a file, on a peripheral or a s

### The process

Backups require a lot of discipline and rigor from the system administrator. It is necessary to ask the following questions:
Backups require a lot of discipline and rigor from the system administrator. System administrator need to consider the following issues before performing backup operations:

* What is the appropriate medium?
* What should be backed up?
Expand All @@ -63,13 +63,19 @@ Backups require a lot of discipline and rigor from the system administrator. It
* Automatic or manual?
* Where to store it?
* How long will it be kept?
* Is there a cost issue to consider?

In addition to the above mentioned issues, system administrator should also consider the economic cost, performance, data importance, bandwidth usage and other factors according to the actual use scenario.

### Backup methods

* **Complete**: one or more **filesystems** are backed up (kernel, data, utilities, ...).
* **Partial**: one or more **files** are backed up (configurations, directories, ...).
* **Differential**: only files modified since the last **complete** backup are backed up.
* **Incremental**: only files modified since the last backup are backed up.
* **Full backup**: refers to a one-time copy of all files, folders or data in the hard disk or database.
* **Incremental backup**: refers to the backup of the data updated after the last Full backup or Incremental backup.
* **Differential backup**: Refers to the backup of the changed files after the Full backup.
* **Selective backup (Partial backup)**: Refers to backing up a part of the system.
* **Cold backup**: refers to the backup when the system is in shutdown or maintenance state. The backed up data is exactly the same as the data in the system during this period.
* **Hot backup**: Refers to the backup when the system is in normal operation. As the data in the system is updated at any time, the backed-up data has a certain lag relative to the real data of the system.
* **Remote backup**: refers to backing up data in another geographic location to avoid data loss and service interruption caused by fire, natural disasters, theft, etc.

### Periodicity

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