The ability to provide a detailed backstory provides richness to a character and I love how mine gets creative with what she knows...even when she totally makes stuff up :D
To keep her up to date in ongoing roleplay, I frequently provide minor updates to her backstory which she soon takes into account. I once heard that we could provide an external link in the backstory that could be incorporated. This sounded like the perfect solution. However, I haven't found that documented anywhere and after having tried to do just that several times, feel quite comfortable in saying that does not work..not for me, anyway.
Assuming that this is not currently implemented, please consider providing this ability. Any text added to the backstory from an external page would (of course) still count toward the 10,000 character limit but it would permit dynamic additions to the backstory during continuing roleplay without manual attention by me. The 'basics' of the character should always be present in the backstory form so that if a connection to the external page failed or was simply empty, nothing would lost except new information that might have added addition context to current events known by the character.