What I meant is to use at least two different optical discs, not of the exact same type, which could be one Panasonic Blu-ray disc and one Taiyo Yuden DVD-R disc, each burned on a different drive. In addition to that save a copy on your harddrive.
Should i also put them in resealable plastic sleeves for more protection against dust ?
I don't have personal experience with this so I cannot say for sure, but I wouldn't put both discs in the same (type of) plastic bags in case chemicals in the bag makes the disc last shorter rather than longer.
Also wich file system is the best for the dvd's iso/udf hybrid or is udf only enough?
Blu ray is always iso so that will stay like that.
It doesn't matter that much, but I'd use UDF+ISO or Joliet+ISO or UDF+Joliet+ISO, since the ISO filesystem alone has a short limitation on file/folder names.
Also why should i burn each copy on a different pioneer drive will they not both give same burning results ?
Same reason as always: Don't put all your eggs in one basket. If one drive makes bad burns, it won't affect all your discs.