| What is Backup |
Eventually computer/Laptop/Mobile system intend to breakdown so the copies of computer/Laptop/Mobile data need to be kept in such a way that can be retrieved in case of requirement. So, the term backup comes in picture. Backup is frequently used term in Information Technology. It is a mechanism of copying data that is used
- to keep copy of data for future use or
- for transfer from one location to another or
- for restoration and recovery in case of storage media failure
- for keeping at safe location
| Advantage |
- Minimize the risk of loosing data
- Can Be used to move from one place to another
- Can be use to create clone of data
| Disadvantage |
- More storage is required to keep copy of data
- Expensive to maintain
| What can be backed Up |
More critical data needs more attention for taking backup and keeping at safe location. For example, customer details and financial transactions are very critical data for Banks. Banks maintain multiple copies of data backup and keep at different safe locations. So that they can use in the case of equipment failure or they can keep it safe from theft.
Backup can be taken of normal files like Notepad, Word Documents, Spreadsheets (Excel Format) and folders as well as Data from database. It can be taken as full or incremental or differential backup.
Although different mechanisms are used for taking backup of Files/Folders/Databases in different environment like Windows, Linux, Unix, AIX, IOS, Solaris etc but purpose of taking backup is same.
In case of database, backup can be taken either as physical backup or logical backup.
| Backup Media |
There are different Backup Medias like Hard Disk, Optical Storage like Compact Disk/DVDs/Blu-ray Disk, Magnetic Tapes like DDS/SDLT/LTO Tape, Zip Drive, USB etc those are used for taking backup.
For taking backup, normal operating system copy command as well as backup software utilities are used those are offered by different companies. In Information Technology environment, backup is a routine activity that is performed by some specialized personnel.
| What is Restoration |
Retrieving of data from backed up files/data is called restoration. So, restoration is the process of getting back data from the backup media or backup file. Different mechanisms are there for restoration from physical database backup and logical database backup.
| What is Recovery |
Process of getting data up to the particular point is called recovery. Sometime, recovery is separately required to get data up to a particular recovery point. Steps are different for recovery from Full Database backup, Differential backup and Incremental backup.
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