do budoucna to nejspis pujde... Externi ukladani, logovani
You can log into USB flashes or into MicroSD/CF (on Routerboards) by specifying it’s directory name before file name. For example, if you have accessable usb flash as usb1 directory under /files, you should issue following command:
/system logging action add name=usb target=disk disk-file-name=usb1/log
Takže už to jde :)