Hello bouba,
The system recovery methods are different from manufacturer to manufacturer, and PC to PC. I'm not sure who the manufacturer of your PC is, but the fact that they have left a copy of your old PC structure is great. I wish all PC's come with the same, however, it is safe to delete, and your windows installation files would not be linked in any way. If your unsure at all, the safest method is to rename the folder, reboot, make sure everything is ok and then delete. However, I would leave your system recovery folder where it is.
As for your second question, will putting your files onto an external HDD, the answer is, not one bit! The only advantage of putting your files onto an external HDD is to save space on your local HDD and make your files portable.
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