http://www.onlinebackupsreview.com/spideroak.php
One important feature of SpiderOak's backup service is that older versions of a file are kept. So if you overwrite your thesis and don't notice right away, restoring it from one of the many other backup services would give you the overwritten file. Only services which support Version History would give you the complete version, rather than the newest version (the overwritten one).
In addition, if you delete a file, it's moved to your "Deleted Items" folder in SpiderOak, and is only removed if you delete it from there (via the SpiderOak software interface).
Like every other backup service, only the changes of the backup set are transmitted during a backup process. However, since SpiderOak runs across multiple computers, they have to go a bit further. Say you have two files on two different machines, which are 50% identical. One machine backs up the entire file, while the other machine only backs up the differences.
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