• Explain the various types of backup. + We have 3 types of "backup" as: 1. Full backup.-Full backup every month: means all the backup data is ours For example: We have a directory of files of 4: A, B, C, DWhen we configure the Full backup, the backup software will back up all data files both 4: A, B, C, DPros: easy to restore data. When you need to recover, it will restore the entire database of day full backup. Safety for data Cons: long time backup. Consume storage space. Investment costs of large storage devices. 2. Backup Differential Differential backup each week: this is the "Backup" what changed in comparison with the "full backup". For example:in the folder with 4 file: ABCDWhen the backup configuration: "full backup" on Sunday, "Differential backup" on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. If number 2 in a file folder E: ABCDE "backup Differential" backup file to: E3 If many files in the folder F: ABCDEF-> "Differential backup" to the backup section is not changed from the most recent Full backup date is Sunday, should be back up files: EF Likewise for the next day. Pros: time "backup" faster, save archive, data recovery speed is faster than "incremental backup" Cons: When you need to restore data should have 2 copies of the "backup": A file "full backup" the "nearest" and a Differential Backup files on when recovery in specific cases, such as for example: Suppose you need to restore the files on the fourth time-you need the file "full backup" on Sunday's and "Differential" backup on Wednesday. 3. Incremental backup incremental backup each day: It supported what changed in comparison with the "Incremental backup". For example:in the folder with 4 file: ABCDWhen the backup configuration: "full backup" on Sunday, "Differential backup" on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. If in a second file E directory: ABCDE "Incremental backup" to back up a file the number: E If on Tuesday for more file folders F: ABCDEF-> "incremental" backup to backup the changes from the section on "backup Incremental" is the second most recent backup should be the first one. Likewise for the next day. Pros:the fastest backup time hosting small backup for Cons:When you need to restore data to meet the backup: A file "Full backup" for the last time and all the files "incremental backup" from this moment "Full backup" to the time needed to restore the . Restore times longer than "backup Differential"
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