In theory, Barcelona only need to hold Real Madrid to a draw if they want to qualify for the next round phase. so, Barcelona has had half way to the final phase of the Copa del Rey. plus, they have the advantage of playing at their own headquarters, Camp Nou. meaning, the probability of Barcelona to qualify for the next phase is very large. that way, Xavi has a big chance to win the Copa del Dey trophy besides La Liga. if that happens, Xavi will succeed in giving three trophies this season. although previously failed in the Champions League, also in the Europa League, however, as a Barcelona fan, I would be very happy if this scenario materialized.
But by the way, this is just a scenario that in fact Real Madrid will not let Barcelona advance to the next round. despite losing in the first leg, and the match will be held at the Camp Nou. that, will not have the effect of fear on Carlo Ancelotti's team, they will appear all out and work hard to overthrow Barcelona no matter what. This match is not only about the Copa del Rey trophy, but more about the prestige battle between the two big rivals from the Spanish club.
On the other hand, Real Madrid will also target another trophy, namely the Champions League and they will try their best to become a finalist in the competition.
This season I think it's only natural that Barcelona perform better in domestic competition, regardless of whether it's La Liga, Copa Del Rey or the Spanish Super Cup because of the defense and the balance of the level of play. Barcelona are still favorites at home even though Real Madrid will be looking to win the Copa Del Rey, but Barcelona are most likely to qualify for the final.
This season is a new level for Barcelona, I think you deserve to be the favorite for them to win all the existing competitions after failing in the Champions League and Europa League. I think Madrid will definitely be very focused on the Champions League instead of La Liga and the Copa Del Rey, of course.