The Time War
An article by Russell T Davies in the Doctor Who Annual 2006 states that Skaro, like Gallifrey, was devastated at the end of the Time War. This suggests that the Daleks had managed to rebuild and/or reoccupy their home planet and is somewhat consistent with War of the Daleks. This is also generally consistent with Dalek Caan's claim in "Daleks in Manhattan" that his planet "is gone... destroyed in a great war".
This may also simply be that Skaro survived the events of Remembrance of the Daleks (as portrayed in War). However, as prior continuity established the existence of alternative Dalek installations and colonies outside their homeworld, Skaro's own survival is unnecessary to account for post-nova remnants.
An alternative explanation could also mean that the Seventh Doctor's actions in Remembrance were particular episodes within the Time War. While the canonical status of the novels is uncertain, Russell T Davies intimated in the Doctor Who Annual 2006 article that various Dalek stories take place as parts of the Time War, such as Genesis of the Daleks, which he refers to as "the first strike".
Despite this, Skaro makes an appearance in the first episode of Doctor Who: The Adventure Games, entitled "City of the Daleks". As current executive producer Piers Wenger insists the interactive episodes are canon, surviving Daleks found the Eye of Time, an artifact of immeasurable power that gives its users unlimited control over space and time. With this power, the Daleks remove Skaro from the Time War and launch an invasion of Earth in 1963, killing off all humanity and conquering Earth. The Eleventh Doctor subsequently goes to Skaro, discovers the Eye, and releases it back into the Time Vortex before the Daleks find it, thus negating Skaro's post-nova survival outside the Time War and restoring the proper timeline.
At the start of "Asylum of the Daleks", the Eleventh Doctor is summoned to Skaro by Darla von Karlsen (a human converted into a Dalek "puppet"). The planet is devastated by war, but still in existence. The area on Skaro the Doctor is summoned to, is in (or near by) the dalek city. The city looks much like the one seen in "The Daleks", which the exception of a towering Dalek statue/building.
Read more about this topic: Skaro
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