SQL Server backup progress

SQL Server backup progress

 

  

All,

This is an SQL 2k sp4 box. There is no problem but I'm wondering something.
When I do a full backup using a T-SQL command it shows the percentage
completed. It is usually 10 then 20 then 30 and then it will show something
like 42% complete. Basically it stops incrementing by 10 though it starts
that way. Can anyone tell me why this happens?

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