What do you mean by on-line back-up and off-line back-up?

Online backup is a service that provides the user an online system for taking backup and storing files. Online service providers are companies which provide software for the clients for taking backup of the data, the clients copy, compress, encrypt and then send it to the backup service providers for the data to the stored.

Offline backup storage is a process when the online exchange services are stopped all the outstanding operations are immediately committed to appropriate database. Now the exchange takes place on an offline system no client will submit or access the exchange system. The offline backup job is performed while the information stored is not accumulated; this backup is basically a file level copy of the information store database.

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