This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A reserve or substitute.

n. Computer Science A copy of a program or file that is stored separately from the original.

n. Support or backing.

n. Music A background accompaniment, as for a performer.

n. An overflow or accumulation caused by clogging or by a stoppage: a backup in the sink; a backup of traffic at the drawbridge.

adj. Extra; standby: a backup pilot.

n. A reserve or substitute.

n. A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged.

n. An accumulation of material that halts the flow or movement of something.

n. reinforcements

adj. standby, reserve or extra

adj. That is intended as a backup.

n. anything kept in reserve to serve as a substitute in case of failure or unavailability of the normal or primary object; -- used for devices, plans, people, etc. Also used attributively.

n. a musician or group of musicians accompanying a soloist, whether vocalists or instrumentalists.

n. a person or group of persons serving as reinforcement for another or others.

n. an accumulation, overflow, or reverse flow (in traffic or a liquid flow system) caused by a stoppage or other malfunction.

n. A copy of a program or data from a computer onto a data-storage medium, usually one that may be removed to safe storage at a distance from the computer; it is used to preserve data for use in the contingency that the original data on the computer may be lost or become unusable. A backup that is removed from the building housing the computer system (to provide protection against loss of data in a disastrous event such as a fire) is called off-site backup. Also used attributively.

n. The act or process of creating a backup{5}.

n. a musical part (vocal or instrumental) that supports or provides background for other musical parts

n. an accumulation caused by clogging or a stoppage

n. (computer science) a copy of a file or directory on a separate storage device

n. the act of providing approval and support

n. someone who takes the place of another (as when things get dangerous or difficult)

"For example, if you put the backup and restore scripts in a folder called h: \backup and your run the backup script, it will create a folder called h: \backup\tweedeckbackup and copy into it all your TweetDeck settings."

accretion    accumulation    duplicate    duplication    approving    approval    blessing   

accompaniment   

storage    access    additional    audio    emergency    digital    monitor    hardware    surveillance    tactical