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I feel strongly that backups should be a daily event. We follow a schedule where a normal, full backup occurs every Monday, and incremental backups are scheduled each remaining business day, Tuesday through Friday. The incremental backup only backs up the files that have been modified since the last backup, and is a heck of a lot faster that a full backup. Just be aware that restoring files that were saved during incremental backups requires that you be able to locate the most recent version of the file that you want to restore, so you have to keep track of it.