1. Backup :
Backup generally suggests the duplicate of your data. When a backup is initiated, it generates copies of your files, comprising files pertaining to your website and mailboxes. These copies are conventionally kept in a different location than the original content, thus making them ideal for disaster rehabilitation. Backups are the mechanism that could take minutes, hours, or days to complete, depending on the data. This conveys that the data at the end of the backup may not be compatible with the data at the time when the backup initiated. Backups are planned to be stored for long periods of time and, if they are stored off server, they can be used to restore servers after a server failure.
2. Snapshot :
Snapshot refers to an instantaneous “picture” of your server’s file system at a certain period of time. This picture apprehends the entire file system as it was when the snapshot was taken. When a snapshot is accustomed to restore the server, the server will revert to exactly how it was at the time of the snapshot. Snapshots are designed for short term storage. When space departs, new snapshots eventually overwrite older ones. For this reason, snapshots are usually only good if you want to revert to a recent version of your server.
Difference between Backup and Snapshot :
|1.||Backup can be stored in another location, same server, or even the same drive in this case.||Snapshots can be stored only in the same location where original data is present.|
|2.||Backup may have differences based on when the backup started and ended.||Snapshot is a “picture” of your server at present period of time.|
|3.||It is a long term process and might take a lot of time to complete the procedure.||It is a short term process and takes very less time, as compared to backup, to complete the procedure.|
|4.||Backup comprises of only file system.||Snapshots comprises of different types of systems like the files, software, and settings of that type.|
|5.||Backup takes long time to copy data.||Snapshot takes very less time to copy the data.|
|6.||Incase of SQL server, backup is a paid service. A person can use this service to automatically backup most recent data every night.||Incase of SQL server, snapshot is a free feature that is used to manually create duplicate images of the servers. One can easily generate them at any time.|
|7.||Backup is not a backup unless the data exists in several distinct locations. Backups should be easily and quickly restored. Backups should be verifiable.||Snapshot by itself is not a backup. But it can be used as an essential part of the backup process. Snapshot is used as a part of the data movement process to a backup file. It is removed when the backup job is completed.|
Attention reader! Don’t stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.