back up

to support

• I'll back you up.
• Tom stayed to back me up.
• I need you to back me up.
• He backed us up in the case.
• Nobody backed up what I said.
• Tom is willing to back Mary up.
• They backed me up in everything.
• They backed him up in everything.
• He backed us up during that incident.
• I need to find someone to back up Tom's alibi.
• Go talk to Jane. She'll back up everything I've said.
• He will not get the job without someone to back him up.
• We should back him up so as to make the project a success.
• I hope you've got some proof to back up your allegations.
• Tom couldn't produce any evidence to back his statement up.
• Guys, I'll do my utmost to back you up. We'll make this event a success no matter what!
• If there is somebody to back me up, the business will be successful.
• I talk like this 'cause I can back it up.
• I'm fed up with always backing you up.
• The agreement, unless backed up by action, is meaningless.

to drive a car backwards

• Tom backed up the car and turned around.
• Don't back up. There's a tree behind you.
• She managed to back up through the narrow driveway.
• This is the first time I've ever backed up this car.
• That kid was almost run over when the truck backed up.
• Tom always looks in the rearview mirror before he backs up.
• "What happened to your nose?" "When I was backing my car up I went to check behind me, convinced that the car window was open, and bashed my face into it!"
• While backing up, I bumped into another car and set off its alarm.
• Yesterday, when Tom was backing up his car, he ran over Mary's bicycle.

to make a copy of computer information

• Tom backed up his data.
• Make sure to back up all your files.
• Tom started to back up.
• I am spending my Saturday backing up my computer files to reboot my computer and filling out applications.