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File backups will normally run on a set schedule. To perform a backup manually:
An incremental backup only backs up new files and files that have changed since the last backup of any kind. This is a faster, more efficient process because it ignores files that are already backed up or haven't changed. You can perform an incremental backup after making a change to a single document and it will be backed up along with the other files.
A full backup performs a backup of all specified files and folders regardless of whether they have changed since the last backup. This option transfers all data, and can be a lengthy process if there are many files or very large files. It is not often necessary to perform a full backup manually.