To virtualize or not to virtualize in virtualbox

Im thinking of virtualizing my current ubuntu 14.04 setup but im not sure if its a good idea and if it would make performance significantly poorer. The reason i want to P2V is that i would be able to snapshot the machine for quick restoring if something goes wrong or if i have hardware failures like loose a drive. Let me start by what the machine is for:

This is my disk setup and Hardware



I have 2 disk that are ntfs because i have windows 7 machine that uses sdb1 as a mounted physical disk and sdc2 as a shared location. My System disk is a SSD

Applications running at all times:

- Sonarr
- Sabnzbd
- Xampp (MySQL, Apache(Owncloud,plexpy,plexRequest,PhpVirtualbox))
- Sickrage
- Teamviewer
- Deluge Deamon
- Teamspeak Server
- Couchpotato
- Virtualbox
- Emby server (No really used..more for testing)
- xRDP

My virtual Windows machine needs at least 4GB of ram all the rest of the ram could go to ubuntu. both machines would run side by side

My questions:

Is it a good idea?
if it is a good idea, will the performance impact be noticeable?
What host OS to use? (just another ubuntu desktop?)
What to use to do the P2V?
How would my disk setup translate to the VM? (things are on different partitions)
Would it be better to mount physical disk for everything except system disk? Or create vdi's all around?
Any other things i should consider?

If this was your setup what would u do? Also is virtualbox with phpvirtualbox the best choice?

Im still learning the linux world and im loving it! I have only started using ubuntu for 2 weeks now and my linux knowledge is very limited and coming from a windows world, conversion is slow but steady :)

Thanks in advance :)