Logging data usage

Hi,

I’m new here so apologies if this has been covered.

Under PPP Interface, I have enabled the columns for Tx/Rx Bytes, if I am correct then this will show how much data has been used in that active session.. this is great, But… how (or is it even possible) to log the usage indefinitely? I have a few clients connected and would like to see how much data they are using on a monthly basis.

Can this be set to log to file, or any other way of retaining this information?

Kind Regards,

Stewart