SkyDrive would give you 25 gig of space for free.
http://explore.live.com/windows-live-skydrive
I have a secure FTP site I built into my Modified Router.
I can change the size by swapping memory cards.
It's not a way to go for the faint of heart or someone not use to modding things like this,
but very secure and no PC needs to be left on all the time.