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Remote Backup Transmission Time Calculator
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© 2004 Remote Backup Systems, Inc.
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http://remote-backup.com
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This calculator will calculate the time required to transmit a backup over an
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Internet connection. Enter the original (native) size of the files to be backed
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up, the compression ratio, and the slowest Internet speed between the
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Client and the Server.
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RBackup typically compresses standard business data about 75%. This
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means that a file of 100 megabytes will become 25 megabytes before it is
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sent to the Server. It will be stored on the server in its compressed form.
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Some data, like Word Perfect and MS Word files may compress as much
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as 90%, while some files like pictures and music may compress only 5%.
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Pictures and music files are not considered "typical" business data.
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This calculation considers only transmission time, which is directly related
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to costs of doing business. Time for the Client software to prepare a backup
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by doing its compression and encryption is not a part of this calculation, and
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can be effected greatly by constraints outside the control of the software.
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Transmission speeds can vary widely from this calculation depending on
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outside factors like the configuration of the software, routers, firewalls, ports,
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and CPU speeds. This calculation is for optimal connections. This calculator
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is not intended for use as a benchmark or acceptance test for the software.
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Typical Internet Speeds
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The following chart illustrates the typical speeds of some common types of
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Internet connections. When calculating the transmission time for Remote
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Backup, use the slowest of the Client's UPLOAD speed and the Server's
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DOWNLOAD speed. Download speeds are typically much higher than upload
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speeds. Backups go at the speed of the slowest Internet connection between
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the Client and the Server.
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Some Internet Connection Types can be delivered in different speeds. This
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chart contains common speeds for common connection types. Contact the
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Internet Service Providers who provide the connections to determine the
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exact connection speeds in your specific case.
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Internet Connection Type
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Kilobits per second (kbps)
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56K Modem
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56
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Cable Modem
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1000, 512, 128
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DSL
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384, 512, 1000
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T1
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1530
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LAN
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10000, 100000
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The Calculator
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Change the numbers in GREEN. Press the RECALCULATE button. Your
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results are displayed in RED at the bottom of the calculator.
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File Size (megabytes)
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Total native file size of the file(s) to be backed up.
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Compression Ratio %
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RBackup compresses typical business data about 75%.
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Internet Speed (kbps)
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The speed of the slowest Internet connection between the Client and the Server. (See Chart)
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Backup File Size (megabytes)
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Calculated size of this backup as stored on the RBS Server.
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Transfer Time (minutes)
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Calculated transmission time
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