From a graphics designer to another designer, use cloud storage places such as Microsoft's OneDrive or e-mails or Google Drive, or online portfolio's such as Deviant Art, or Behance. Free, and worth it.

Plus, funny you that you mentioned that you need your old stuff to remember your drawing style, since drawing style is something that finds you, not you find it. :P

I like what you're doing, but no offense, I wouldn't want to play as my favorite midnight blade who looks like how you drew it, at least scarlet blaze looks bit more decent that the official one, who looks like a transvest1te since day 1, so categorically is not appealing visually and I am avoiding like cancer to even have a thought about trying him/her out. ;D

Ironically enough, I would prefer to try out midnight blade with longer straight hair downwards, or maybe more spikier from the static electricity. Good example I like are such as - Toshiro from Bleach, both the regular version and the bankai final form, Gintoki from Gintama, or Sephiroth from Final Fantasy. Though these guys, except for Toshiro, are old enough that it suits them, where in this game for some reason these characters are just 14-16 year olds...even Crimson is 16, and youngest is Midnight Blade having 14, the rest is 15 and/or 16.