--> Backing the data or software and having the hardware backup leads to implementing network availability.
--> It is important to take the backup of data so that we can restore it whenever,
i) if a hard disk crashes
ii) some software program is corrupted
iii) If disaster took place
--> Data changes more in software compared to hardware.
--> If data in the files changes so many times in a day, backup procedures should happen a few times a day or nightly to ensure all the changes are captured and kept.
--> If data is changed once in a month, backing up data every night is a waste of time and resources.
--> The operations team is responsible for defining which data get backed up and how often.
--> So, how do we know which data have changed and need to be backed up without having to look at every file’s modification date? This is accomplished by an archive bit.
--> Every operating system's file system keeps track of what files have been changed by setting an archive bit. If a file is changed or created,the file system sets the archive bit to 1.
--> Backup software has been created to review this bit setting when making its determination on what gets backed up and what does not.
--> There are different types of backups we can use it to backup data
1) Full Backup
--> In this backup method, all data is copied to backup storage.
--> Slowest Backup because it uses most of the resources.
--> Fastest Restore.
--> Makes archive bit to "0" once files are copied.
2) Incremental Backup
--> In this Backup Method, only the data is copied into backup storage which are modified or created since last full backup or incremental backup .
--> Basically copies the files which are listed with archive bit "1 " since last full backup or incremental backup.
--> Once it copies the files into backup storage, it resets all the files archive bit to zero.
--> Fastest Backup because it does not use most of the resources.
--> Slow Restore
3) Differential Backup
--> In this Backup Method, only the data is copied into backup storage which are modified or created since last full backup.
--> Basically copies the files which are listed with archive bit "1 " since last full backup.
--> Once it copies the files into backup storage, it does not resets the files archive bit to zero.
--> Fastest Restore.
4) Copy Backup
--> This method is similar to Full Backup Method.
--> But in this method archive bit does not reset to zero once files are copied into backup storage.
--> Basically used when we are doing any upgrades or system maintenance.
Note: It is important to perform the testing of restoration of backup of data.
--> It is important to take the backup of data so that we can restore it whenever,
i) if a hard disk crashes
ii) some software program is corrupted
iii) If disaster took place
--> Data changes more in software compared to hardware.
--> If data in the files changes so many times in a day, backup procedures should happen a few times a day or nightly to ensure all the changes are captured and kept.
--> If data is changed once in a month, backing up data every night is a waste of time and resources.
--> The operations team is responsible for defining which data get backed up and how often.
--> So, how do we know which data have changed and need to be backed up without having to look at every file’s modification date? This is accomplished by an archive bit.
--> Every operating system's file system keeps track of what files have been changed by setting an archive bit. If a file is changed or created,the file system sets the archive bit to 1.
--> Backup software has been created to review this bit setting when making its determination on what gets backed up and what does not.
--> There are different types of backups we can use it to backup data
1) Full Backup
--> In this backup method, all data is copied to backup storage.
--> Slowest Backup because it uses most of the resources.
--> Fastest Restore.
--> Makes archive bit to "0" once files are copied.
2) Incremental Backup
--> In this Backup Method, only the data is copied into backup storage which are modified or created since last full backup or incremental backup .
--> Basically copies the files which are listed with archive bit "1 " since last full backup or incremental backup.
--> Once it copies the files into backup storage, it resets all the files archive bit to zero.
--> Fastest Backup because it does not use most of the resources.
--> Slow Restore
3) Differential Backup
--> In this Backup Method, only the data is copied into backup storage which are modified or created since last full backup.
--> Basically copies the files which are listed with archive bit "1 " since last full backup.
--> Once it copies the files into backup storage, it does not resets the files archive bit to zero.
--> Fastest Restore.
4) Copy Backup
--> This method is similar to Full Backup Method.
--> But in this method archive bit does not reset to zero once files are copied into backup storage.
--> Basically used when we are doing any upgrades or system maintenance.
Note: It is important to perform the testing of restoration of backup of data.
Reference : Shon Harris CISSP all in one Guide
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