Where is Yui stored in SAO II? We know that Yui was saved in Kirito's NervGear's local memory in the first season of Sword Art Online but in in the second season when Kirito is in Gun Gale Online, when everyone is watching Battle of Bullets Yui is there with everyone else watching it in ALO. she also talks to Asuna on her phone when she heads off to the hospital and in Agil's bar when Kirito sets up the cameras for her.

in all of these cases Kirito isn't using his NervGear and i would suspect it is turned off. so where is Yui now stored? and how is she able to go from this place to ALO, Asuna's Mobile and the cameras in Agil's bar?
According to a Q&amp;A session1 (EX00～Face to Face～) in the third popularity contest held by Kawahara Reki, as Kunori Fumio (his webnovel penname), in 2005:

Her core program routine runs and is stored in the local memory of Kirito's NerveGear and takes up about 3TB.

1 Chinese-translated copy of the Q&amp;A session