even if not; even without
A conditional phrase meaning 'even if (something) does not exist' or 'even without (something)'. Used to express that a situation holds regardless of the absence of something.
お金がなくても幸せになれる。
You can be happy even without money.
経験がなくても応募できます。
You can apply even if you have no experience.
なければ is a conditional meaning 'if not', often used in obligations (なければならない). なくても is softer, meaning 'even if not'.
From the negative continuative form なく of the adjective ない (not exist) combined with the conditional particle ても (even if).