Minecraft CurseForge

The site linked below has a good list of possible cloud hosting solutions. Be sure to read the information on each one as not all of them offer the same level of features.

http://freebies.about.com/od/computerfreebies/tp/free-cloud-storage.htm

My personal recommendation is setting up your own, however this requires having the hardware and technical know-how to do so.

https://owncloud.org/

There's this entertaining thread as well, which has some more information that you may find helpful.

http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/2501895-pixel-format-not-accelerated-windows-10

If you read the first few lines of the crash report, you can usually find the key to what caused the crash.

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 16. 5. 22 오후 9:02
Description: Initializing game

org.lwjgl.LWJGLException: Pixel format not accelerated

Googling Pixel format not accelerated reveals the following website which will guide you through how to address the issue: http://hopper.minecraft.net/help/pixel-format-not-accelerated/

Quote from TheFarix jump

Unfortunately, it doesn't look like you can create a private pack to share with just your friends.

 Not yet, but many of us have our fingers crossed. You can create and share private packs fairly easy on Tekkit and FTB.

I agree with this, great suggestion.