It's hard to envisage an online voting system that has a paper component to it. One concern about online voting here and in a lot of countries would be the secrecy of the ballot, which means in this country not just that you don't have to show anyone else how you voted, but you can't prove to anyone else how you voted even if you want to. The fear, then, is that if there were online voting, how do we know there isn't someone sitting and looking over your shoulder, making you vote in a particular way or bribing you to vote in a particular way? If there were a paper record of how you voted, then clearly the problems would be even greater, so there is really no demand here for online voting.
I realize that is one of the terms of reference of the committee, but it's not something that Ireland could really throw much light on.