back up (
http://definr.com/back up)
v 1: give moral or psychological support, aid, or courage to;
"She supported him during the illness" [syn:
support]
2: move backwards from a certain position; "The bully had to
back down" [syn:
back off,
back down]
3: establish as valid or genuine; "Can you substantiate your
claims?" [syn:
substantiate,
back]
4: make a copy of (a computer file) esp. for storage in another
place as a security cop; "You'd better back up these
files!"
5: become or cause to become obstructed; "The leaves clog our
drains in the Fall"; "The water pipe is backed up" [syn:
clog,
choke off,
clog up,
congest,
choke,
foul] [ant:
unclog]