There have been a few questions regarding this, so I thought I'd post to try and clear up any uncertainty.
For the Super EC they do not carry over from last round unless you had stated a boost for R2. You will have to restate which boost you would like as all boosts were cleared between rounds. You may use the same boost again or a different one.
For Salvaging cards, you may go over your initial limit of 9 off-element copies of a card and 24 in-element copies of a card, these limits are just for the initial building phase.