System vs. Online Backups
The main advantage of online backup is that all databanks, including the system databanks, can be backed up while the system can remain operational. The backup is initiated and executed by use of SQL statements only. The disadvantage can be that there must be enough disk space available to copy the complete database.
If the disk space is limited, a system backup can be preferable. For a system backup, the database server must be stopped. A system backup needs certain SQL statements to be used together with operating system commands for file copying, etc.
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