Create a restorable system image using Clonezilla via NFS shares
How to create a restorable system image of your computers hard drive directly to your Synology Diskstation via NFS shares using Clonezilla (Free/Opensource software)
The steps to backup via SMB (windows shares) is very similar.
How to setup the NFS Shares tutorial • How to Setup NFS Shares with your Synology
Link to Clonezilla website http://clonezilla.org/
You must create either a usb or cd boot disk
How to create here http://clonezilla.org/clonezilla-live...
Once done boot the computer you'd like to create an image of with the disk or usb thumb drive installed then follow video.
I recommend a website called http://ninite.com/ just select the apps you want to install all at once easily.