back up

give moral or psychological support, aid, or courage to

• “She supported him during the illness”
• “Her children always backed her up”

move backwards from a certain position

• “The bully had to back down”

establish as valid or genuine

• “Can you back up your claims?”

make a copy of (a computer file) especially for storage in another place as a security cop

• “You”

become or cause to become obstructed

• “The leaves clog our drains in the Fall”
• “The water pipe is backed up”