Backup Method in SAP-Oracle

Backup Method in SAP-Oracle

1.Full Backup : In full back up,where all the files and folders selected for the backup will be backed up.

Advantage:-

Restore are fast & easy,as the complete list of files are stored each time.

Disadvantage :-

• Time consuming
• Requires lot of storage
• Exact same files are be stored repeatedly

2.Incremental Backup: is a backup of all changes made since the last backup

•      One full backup is required.

Advantage:-

• Much faster backup
• use of storage space as files are not duplicated

Disadvantage:-

• Restores slower than full backup
• Restores little more complicated
• First full backup & all incremental backup are needed.

Eg: Suppose,you take a full backup on Monday,Tuesday backup would only contains that data which has changed since Monday,Wednesday backup only contain data that has changed since Tuesday.

3.Differential Backup : similar to an Incremental backup in that starts with a full backup,subsequent back up only contains data that has changed

•       Differential backup contains all of the data that has changed since the last full backup

Advantage:-

• Much faster backup
• Faster Restore

Disadvantage:-

• Slower than Incremental backup
• Restore are slower than full backup

Mirror Backup :Mirror backups are as the name suggests a mirror of the source being backed up. With mirror backups, when a file in the source is deleted, that file is eventually also deleted in the mirror backup. Because of this, mirror backups should be used with caution as a file that is deleted by accident.

Advantages:

• The backup is clean and does not contain old and obsolete files

Disadvantages:

• There is a chance that files in the source deleted accidentally, by sabotage or through a virus may also be deleted from the backup mirror.

FTP Backup :This is a kind of backup where the backup is done via the File Transfer Protocol (FTP) over the Internet to an FTP Server. Typically the FTP Server is located in a commercial data center away from the source data being backed up.

Advantages:

• Since this is an offsite backup, it offers protection from fire, floods, earth quakes and other natural disasters.
• Able to easily connect and access the backup with just an Internet connection.

Disadvantages:

• More expensive then local backups
• Can take longer to backup and restore. Backup restore times are dependent to the Internet connection.

On-Line Backup :An online backup is a backup done on an ongoing basis to a storage medium that is always connected to the source being backed up.  “On-line” refers to the storage device or facility being always connected.Typically the storage medium or facility is located offsite and connected to the backup source by a network or Internet connection.

Advantages:

• Offers the best protection against fires, theft and natural disasters.
• Because data is replicated across several storage media, the risk of data loss from hardware failure is very low.
• Because backups are frequent or continuous, data loss is very minimal compared to other backups that are run less frequently.

Disadvantages:

• Is a more expensive option then local backups.
• Initial or first backups can be a slow process spanning a few days or weeks depending on Internet connection speed and the amount of data backed up.
• Can be slow to restore.

Off-Site Backup : Any backup where the backup storage medium is kept at a different geographic location from the source is known as an offsite backup. The backup may be done locally at first on the usual storage devices but once the storage medium is brought to another location, it becomes an offsite backup.

Advantages

• Offers additional protection when compared to local backup such as protection from theft, fire, flood, earthquakes, and more.

Disadvantages

• Except for online backups, it requires more due diligence to bring the storage media to the offsite location.
• May cost more as people usually need to rotate between several storage devices.

Regards,

JUNAID AHMAD
SAP BASIS