The Moles are the defending champions and take on Combined Counties Premier Division side Windsor in the quarter-final on Monday night.
The original tie was set for January 21 but was postponed till Monday because of the snow.
Tallentire said: "Monday's an important game for us. It's a cup that we're keen to hang onto.
"We won it last year, it's sitting in our clubhouse and I've got used to it being there."
Windsor are going well in their division but were rocked by last week's news that star striker Ben Harris is out for the rest of the season with a knee injury and will not be playing against the Moles.
"I do know that they're a better team with him playing and that's a bonus for us," said Tallentire.
"It's two good sides trying to get through."
Flackwell Heath are the latest team to make it through to the semi-final after they beat Wokingham & Emmbrook with Ascot United and Aylesbury United making up the rest of the field.