Disk uses going high every hour!

Hello,
in one of my VPS I've 6 reseller accounts. from WHM reseller center all 6 account's combined disk uses is less than 2 GB. and if we add 1 GB for system files then the disk uses should be 3 GB right?

Last night disk uses were 2.8 GB 43% of the VPS quota. Today its showing 71% 2 hours ago. Right now its 73% and the user directory uses are same.

Can anyone give me a hint how can I check where the disk uses are taking place?

Thanks

 

 

 

 

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