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Why the total database size (roughly 50MB) is different from the size of existing database backups (roughly 10MB) daily???

Thanks

The backups are gzip compressed, which will probably account for the reduction in size. The best way to check they're backing up correctly would be to create a new test database, and import one of the backups to that, and then make sure it has all the same data as your live database.

Not probably
The DB backup is a dump (just text) and gz (or any compression tool) compress essentialy text, so having a ratio 1/5 is pretty normal.

If you unzip the file, your resulting textfile will be around 50M. But not exactly the same size as your DB, your DB is not a flat file.