Back- up in computer
This query is : Resolved
28 November 2007
What do you mean by 'Back-up' in a Computer System ? What are the benefits of doing it. If we don't back-up, what are the consequences ?
28 November 2007
Back up in computer system means copying all the files and folders to seperate location. The practice of grandfather father son methodology may bbe applied for back up.
The benefits of backup shall help us to retain the data updated on a day to day basis.
The consequences of not taking back up on a regular basis may lead to loss of entire data incase of hard disk crash / virus attack into the system.
The benefits of backup shall help us to retain the data updated on a day to day basis.
The consequences of not taking back up on a regular basis may lead to loss of entire data incase of hard disk crash / virus attack into the system.
28 November 2007
What is Grandfather father son methodology ? please clarify it in an understandable manner. Thanks for solving my querty related to back-up in computer.
28 November 2007
Grandfather-Father-Son Backup refers to the most common rotation scheme for rotating backup media. Originally designed for tape back up, it works well for any hierarchical backup strategy. The basic method is to define three sets of backups, such as daily, weekly and monthly. The daily or Son backups are rotated on a daily basis with one graduating to Father status each week. The weekly or Father backups are rotated on a weekly basis with one graduating to Grandfather status each month. Often one or more of the graduated backups is removed from the site for safekeeping and disaster recovery purposes.
A disadvantage of this backup scheme is that it doesn't ensure that media is replaced before it wears out. For example, each daily (son) media is used every week until it fails, unless some method of tracking media age is implemented.
A disadvantage of this backup scheme is that it doesn't ensure that media is replaced before it wears out. For example, each daily (son) media is used every week until it fails, unless some method of tracking media age is implemented.
28 November 2007
What's a "Generational Backup Scheme" And How Does It Work?
A generational backup is one of the simplest, most effective methods for making and keeping backup copies of your data. Properly done, it combines ease of use and data protection.
The most common generational backup scheme is the three-generation or "grandfather-father-son" method. In its most basic form it involves making a complete copy of the data to be backed up on removable media such as tape or CD. This is the grandfather. At the next scheduled backup period, say the next day, another complete copy of the data is made, which of course includes the changes in the data during that period. This is the father. At the next scheduled backup, the third copy, or son is produced.
The fourth backup is made by recording over (or replacing, depending on the media) the grandfather copy. The new copy becomes the son, the previous son becomes the new father and the father is promoted to grandfather. This continues in rotation so there are always three backups, each of a different point in time.
The advantage of saving the two previous backups as well as the current backup is that if the computer data somehow become corrupted and the problem isn't caught until after the backup is made, there are still two uncorrupted, albeit increasingly out of date, backup copies. Given reasonable care, it's unlikely a problem will corrupt all three backups before it is caught. Similarly, if one of the backup copies is damaged, you still have two more. The three-generation backup also makes it easy to store one of the copies (usually the grandfather) in a more secure and often off-site location.
Note that this approach does not take incremental backups into consideration — each backup is a full backup.
Another approach to this is to create a full backup to serve as the grandfather. Let's say this is on a Sunday. The next backup date might be the following Sunday, when the father backup is created, with the son being created a week later. You still can create incremental backups each day between full backups. That way, instead of losing a week's worth of data, at worst you lose a day's worth, or however many days occurred between the corruption of the data and discovering the problem. This further minimizes the potential loss and, since you're using incremental backups, makes those daily backups much faster than full backups
A generational backup is one of the simplest, most effective methods for making and keeping backup copies of your data. Properly done, it combines ease of use and data protection.
The most common generational backup scheme is the three-generation or "grandfather-father-son" method. In its most basic form it involves making a complete copy of the data to be backed up on removable media such as tape or CD. This is the grandfather. At the next scheduled backup period, say the next day, another complete copy of the data is made, which of course includes the changes in the data during that period. This is the father. At the next scheduled backup, the third copy, or son is produced.
The fourth backup is made by recording over (or replacing, depending on the media) the grandfather copy. The new copy becomes the son, the previous son becomes the new father and the father is promoted to grandfather. This continues in rotation so there are always three backups, each of a different point in time.
The advantage of saving the two previous backups as well as the current backup is that if the computer data somehow become corrupted and the problem isn't caught until after the backup is made, there are still two uncorrupted, albeit increasingly out of date, backup copies. Given reasonable care, it's unlikely a problem will corrupt all three backups before it is caught. Similarly, if one of the backup copies is damaged, you still have two more. The three-generation backup also makes it easy to store one of the copies (usually the grandfather) in a more secure and often off-site location.
Note that this approach does not take incremental backups into consideration — each backup is a full backup.
Another approach to this is to create a full backup to serve as the grandfather. Let's say this is on a Sunday. The next backup date might be the following Sunday, when the father backup is created, with the son being created a week later. You still can create incremental backups each day between full backups. That way, instead of losing a week's worth of data, at worst you lose a day's worth, or however many days occurred between the corruption of the data and discovering the problem. This further minimizes the potential loss and, since you're using incremental backups, makes those daily backups much faster than full backups
12 November 2021
A backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event.
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