After the Asgard entered exceptions for the Tok'ra into all their devices, the Tok'ra had hid data about at least one of their bases or outposts on each of the Protected Planets. The data was updated as soon as it had become obsolete, so lost Tok'ra could always find their way home.
Of course, no Goa'uld or Jaffa could ever go there because of the Asgard traps. Moreover, a human slave or even a former host could not retrieve the information because a scanner device ensured that only someone with a symbiote could access the data.
They could send a human slave to fetch the information, if knowledge about it was forced from a Tok'ra, though. To avoid this eventuality, the information was only accessible by someone with a symbiote - there was even a scanner installed to check that there was actually a symbiote present, so a former host would not work.
They arrived on the planet Paviken shortly after midnight. It was very dark. If the planet had any moons, none were up. All was quiet, and the Tok'ra found their way to the almost invisible door set in the mountainside, which led to the room containing the information they had come for. As soon as Malek touched the opening mechanism, a beam played over him, scanning him. The door opened noiselessly, and they entered the chamber.
Malek put his hand on a pad on the wall, and a holographic screen appeared, flashing the glyphs for a planet, along with the name of the commander there.
"We are going to Tehvak's base." He told the others.
Chapter 23: In the Tunnels