How fast are they? When backing up your data over the Internet the transfer speed is restricted by the speed of your upstream connection. Many ISPs advertise high speed Internet downstream connections at speeds of 8Mbits or even more. However, the upstream speed is what is critical for backup operations. On a standard Broadband connection this tends to be about 256Kb with some ISPs able to offer speeds up to 768Kb (e.g. Bulldog, F2S, and Blueyonder). If you want to test your Broadband speed then go to http://www.adslguide.org.uk/tools/speedtest.asp and this will run a test against your connection. A typical Broadband connection will show an upstream speed of about 288Kb in the speed test. On this type of connection it should take about 35 seconds to upload 1MB of data to the BackupsAnywhere servers. Because the BackupsAnywhere client software compresses the data before sending, a typical Outlook PST file will be compressed by about 50%. This will double the throughput to about 2MB in 35 seconds. This means a rate of over 200MB per hour can be maintained on a typical Broadband link. Once you have performed your first full backup, incremental backups will be much smaller. Thanks to the in-file delta technology used by BackupsAnywhere only the changed sections within a file need be transferred to the server. Remember that these in-file delta extracts are also encrypted and compressed before sending. Lets take an example of a user who has a 450MB Outlook PST file and see what happens.
The massive time saving on the second and subsequent backups is mainly down to the unique in-file delta technology used. Please see Benchmarks page for a typical incremental performance scenario. When restoring files this is a completely different story for Broadband. You can take full advantage of the downstream speed. Therefore, whereas the above file will take about 2 Hours to backup on a standard Broadband connection the restore will be about ½ that on even a low speed of 512Kb. If you go for a newer (up to 8Mb) line and you test your speed at about 3Mb, (about average for these connections), then the restore could be up to 12 times faster than the backup. This means that you could restore the above 450MB file in as little as 10 minutes. In reality contention with other Broadband users may slow this down. Back |
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