back up

verb

1. give moral or psychological support, aid, or courage to"She supported him during the illness"
2. move backwards from a certain position"The bully had to back down"
3. establish as valid or genuine"Can you back up your claims?"
4. make a copy of (a computer file) especially for storage in another place as a security copy"You'd better back up these files!"
5. become or cause to become obstructed"The leaves clog our drains in the Fall"