Recycle, Reuse, Reduce - Turning your old PC into your own private cloud server

I have kept upgrading the harddisks with larger volume. But what about the old ones? It is what a waste to throw them into rubbish bins. Those IDE harddisks are no longer accepted to be donated to charity. There is also not well system for recyling this electronic goods in Hong Kong. 

I have came to an idea that I can make use of one of forgotten Dual-core PC and some harddisks of 320GB.

Here is some useful links I read.

Build your own personal cloud server

Turn an old PC into private online storage

Read more: http://www.pcadvisor.co.uk/how-to/software/3378792/build-your-own-personal-cloud-server/#ixzz2EKZdd6st
http://www.pcadvisor.co.uk/how-to/software/3378792/build-your-own-personal-cloud-server/?pn=2

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Quickly Create A Personal Cloud On Your Devices & Stream Media With Bdrive

http://www.makeuseof.com/tag/create-personal-cloud-stream-media-bdrive/

Turn an Old Computer into a Networked Backup, Streaming, or Torrenting Machine with Ubuntu

http://lifehacker.com/5919558/turn-an-old-computer-into-a-networked-backup-streaming-or-torrenting-machine-with-ubuntu

The Most Valuable Technology That A Church Can Implement: Dropbox

http://geekrev.com/the-most-valuable-technology-that-a-church-can-implement-dropbox/

Don't Trust Cloud Security? Here's a Safer Local Alternative to Dropbox

http://internet.wonderhowto.com/how-to/dont-trust-cloud-security-heres-safer-local-alternative-dropbox-0139466/

Build Your Own cloud PC server - Tonido

http://www.pcadvisor.co.uk/how-to/software/3378792/build-your-own-personal-cloud-server/?pn=3

To create multi-user
http://www.tonido.com/forum/viewtopic.php?f=14&t=836