[collectd] Collectd in ram syncing with hdd

[valent.turkovic at gmail.com]

Thanks for both of your suggestions, I'll try both. I first my get to
know collectd/rrdtool setup a bit more to see which files I need to
move and which not to move.

I tried stopping collectd, saving data folder from ram to usb stick,
rebooting the router that now has no collectd data, copying back data
but I still didn't see any graphs :(

So I must be doing something wrong.