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Question: What is a level 0 backup?

Answer: Atomic: This ascertains that all of the required operations take place successfully or none of them will take place.
Consistent: A transaction when committed to the database is responsible to bring it into consistent state.
Isolated: If changes are done in one transaction, it will not affect the other transaction out of its scope. Also, changes will be visible only when transaction is committed to database.
Durable: Even if the system crashes or any hardware failure occurs, the transactions that are committed to database will remain safe.
A transaction will be committed to Extensible Storage Engine (ESE) database only when it passes the durability test. Moreover, a transaction must reach log file on disk by its transition from memory. Consider an example: An email from Inbox folder has to be moved into folder named "New". In this case, following logical operations will be processed by Exchange Server:

Delete email from Inbox Folder.
Insert that email into New Folder.
Update both the folders to reflect the changes.
Now, this three step procedure of moving an email from folder to another will be counted as one transaction, In case any of the operations fail, no transaction will be logged in the memory or to the log file. This reflects the "Atomic" character of transaction that says either all operations will occur or none will occur.Incremental backups can be either level 0 or level 1. A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data, backing the datafile up into a backup set just as a full backup would.

Atomic: This ascertains that all of the required operations take place successfully or none of them will take place.
Consistent: A transaction when committed to the database is responsible to bring it into consistent state.
Isolated: If changes are done in one transaction, it will not affect the other transaction out of its scope. Also, changes will be visible only when transaction is committed to database.
Durable: Even if the system crashes or any hardware failure occurs, the transactions that are committed to database will remain safe.
A transaction will be committed to Extensible Storage Engine (ESE) database only when it passes the durability test. Moreover, a transaction must reach log file on disk by its transition from memory. Consider an example: An email from Inbox folder has to be moved into folder named "New". In this case, following logical operations will be processed by Exchange Server:

Delete email from Inbox Folder.
Insert that email into New Folder.
Update both the folders to reflect the changes.
Now, this three step procedure of moving an email from folder to another will be counted as one transaction, In case any of the operations fail, no transaction will be logged in the memory or to the log file. This reflects the "Atomic" character of transaction that says either all operations will occur or none will occur.Incremental backups can be either level 0 or level 1. A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data, backing the datafile up into a backup set just as a full backup would. Source: CoolInterview.com

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