How long are the graphs kept

Help
1

Where is the settings to set how long graphs are kept for or will it just keep growing? I want to keep at least 5 years of port usage data.

2

How did you get on trying lafs suggestion?

3

I don’t really understand what those default settings mean. If that the default how long is it kept now?

4

Looks like @angryp tried to work out the defaults, check his explanation here: