If the paging space is increasing day on day then it's usually an error in the way one of your applications is coded. Look for processes that have multiple day run times and see if you can restart them.

If ts a self-written c program then things like malloc are often the problem. Not clearing up pointers in other languages can also be he problem. It is possible that the problem is cause by a spiralling data set but that's fairly unusual.

So first step - what apps are the the system is question running and which processes are wasting the memory.