Several points:
An "extended partition" is really the beginning of a linked list of all the logical partitions. It occupies one of the four slots in the MBR partition table, but I would not call it a primary partition.
For primary and logical partitions, the entries in the partition tables point to actual partitions on the disk. The extended partition entry does not.
If you just copy the MBR you are not doing anything to the actual partitions.
If you copy the MBR to another computer, how do you know that the partition table entries are still valid?---unless the other computer is an identical clone. In that case, simply us dd to clone everything, INCLUDING the MBR.
Quote:
I cant lose the things stored there.
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regardless of all the above, be sure you have a backup before you do any of this.