Connector allowing charger and usb computer connection as same time? PoE lead me to idea of having some kind connector, allowing supplying my connected tabled with power from it's charger (5V 2A) and in same time being connected to computer (for backup or whatever purpose).

Do you know such hardware solution?

To make it bold: I want to connect charger for power (2A) and have data connection in same time! (imagine a kind of "Y" saped thing :) )
It works that way by default. You can plug into your computer and use data while charging.  It may be your specific USB cable, I have seen some that don't always work. Bottom line there is nothing special needed