As a rule, cost is based on the amount of data being stored and the services' retention scheme. The first full backup is usually the most bandwidth-consuming part of the process; for ongoing incremental backups, most services use byte- or block-level file analysis as well as data compression to reduce the size of subsequent transmissions dramatically.
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Online backups work well at a variety of speeds. Our test connection ran at about 750 Kbps, but the data- reduction capabilities of the agents we tested would result in reasonable incremental backup windows even at DSL speeds. All the agents we tested are designed to handle interrupted backup transmissions and could theoretically operate over dial-up connections, but from a practical standpoint a company using online server backups should plan on using a symmetrical broadband connection exceeding 100 Kbps.
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