Backup is the activity of copying files or databases so that they will be preserved in case of equipment failure or other catastrophe. Backup is usually a routine part of the operation of large businesses with mainframes as well as the administrators of smaller business computers. For personal computer users, backup is also necessary but often neglected. The retrieval of files you backed up is called restoring them.
Different types of backups are full backup , differential backup, incremental backup and mirror backup
Full backup is the starting point for all other backups and contains all the data in the folders and files that are selected to be backed up. Because the full backup stores all files and folders, frequent full backups result in faster and simpler restore operations
Incremental backup provides a faster method of backing up data than repeatedly running full backups. During an incremental backup only the files changed since the most recent backup are included. That is where it gets its name: each backup is an increment since the most recent backup. The time it takes to execute the backup may be a fraction of the time it takes to perform a full backup .
Differential backup contains all files that have changed since the last FULL backup . The advantage of a differential backup is that it shortens restore time compared to a full backup or an incremental backup. However, if you perform the differential backup too many times, the size of the differential backup might grow to be larger than the baseline full backup.
There is a significant, but sometimes confusing, distinction between differential backup and incremental backup. Whereas incremental backs up all the files modified since the last full backup, differential or incremental backup, differential backup offers a middle ground by backing up all the files that have changed since the last full backup. That is where it gets its name: it backs up everything that’s different since the last full backup.
Restoring a differential backup is a faster process than restoring an incremental backup because only two backup container files are needed: the latest full backup and the latest differential.
- Restore is faster than restoring from incremental backup
- Backing up is faster than a full backup
- The storage space requirements are lower than for full backup
- Restore is slower than restoring from full backup
- Backing up is slower than incremental backup
- The storage space requirements are higher than for incremental backup
Mirror backup is identical to a full backup , with the exception that the files are not compressed in zip files and they can not be protected with a password. A mirror backup is most frequently used to create an exact copy of the backup data.
Backups are also classified according to backup destination and the method it takes
Online backup systems are typically built around a client software program that runs on a schedule, typically once a day, and usually at night while computers aren’t in use. This program should collect, compresses, encrypt, and transfer the data to the remote backup service provider’s servers or off-site hardware.
Backup stored at an online location such as an FTP server or a cloud storage. Online backups provide the highest level of protection against local disaster of any kind: since online backup servers are located remotely, no matter what happens at your site, the backups will stay safe.
Another big advantage of backing up to remote (Online) locations is that data can be accessed from any point of the Earth via the Internet.
Offline backup is a database backup performed when the database is disconnected from the network — in other words, offline — and thus not accessible for updating. This is the safest way to back up because it avoids the risk of copying data that may be in the process of being updated. However, a cold backup involves downtime because users cannot use the database while it is being backed up.
An offsite backup is a copy of a file or document that is located in a location other than physical building that your PC is. It is typically a copy on removable media that is physically transported to a different geographical location, like a different office, safe deposit box, or a friends house. This increased level of safe guard is because if the building where your PC is burns down or is robbed you have another copy located in a different building. The chances of both locations burning down is unlikely. You may think this is off site backup is going too far, but if you have put years of work into something it can be well worth an off site backup.
A local backup a copy of a file or document that is located on the computers hard disk drive. This type of backup provides a minimal guard of ensuring that you have a way to restore your data. This minimal level of safe guard is because if something causes your hard disk drive to fail in your PC, or corrupts your data, you may loose the backup copy also.
You can check the backup software’s from here
As you can see, choosing a backup system requires some forethought, research, and planning. It pays to do your homework when you’re investing in something that could essentially make or break your business in the event of a catastrophe. Cost should always be a big consideration but think of this as an investment in the stability as well as the security of your business.