Why the Backup is bigger than of the DB?

DB Intersystems size = 635 gb, while backup size = 669 gb. Cache version is 2013.1 

I am using cache for Cobas infinity IT solutions for medical lab information system.

Any idea why is this happening? When the DB was smaller, the backup was less in size. but later I noticed this issue

thanks

Yasser

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Answers

Is this a Caché Online Backup? If so, and if the system is active while the backup runs, multiple passes have to be done in order to capture a single-point-in-time record of the database. This means that some of the blocks of the database appear multiple times in the backup file.

Looking at the logfile produced by the backup should give you more information.