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I'm guessing that you need to have a weekly graph stored somewhere for a report, right?
You could use the Graph Archive feature -- and use a cron job to trigger an archive every night. The you'd be able to pull the graphs from the target's archive online wheneve you wanted (page=archive).
Or, you could just run with the graph option to output only the image, and run routers2.cgi from a cron script and redirect the output to a file (page=image).
There are more details about both of these options in the HOWTO file.
If you bookmark a particular page, it will show in the location bar the options to come back to that graph. By adding the page= parameter, you can specify 'archive' or 'image'. The key parameters are 'rtr' (the .cfg file relative to cfgpath), 'if' (the target name), and 'xgtype' (d/w/m/y).
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