Mozy by design does incremental backups. This means that during your initial backup, all of your files are uploaded fully to our servers. On subsequent backups, you will typically only see the backup upload only changes to these files, which allows our data server to update it with the new information. There are instances where a file will need to be uploaded in it's entirety (a process commonly referred to as 'rebasing') to avoid data corruption; this process is done automatically by the data servers themselves, so no action is needed to control or avoid it.
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