Buffalo TeraStation 5010 TS5210DN User Manual page 85

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Select backup settings such as date and time to run.
The following types of backup jobs may be selected:
Type
Normal backup
Overwrite (incremental)
Overwrite (differential)
Files included
All files in the source will be backed up to the destination. You can specify
how many backup versions to keep from 1–400, or select "Unlimited" to keep
all backups until the drive is full. If a specific number of backup versions is
specified, the backup destination folder should be on the same TeraStation
that the backup job is configured from, or on an external USB drive attached
to that TeraStation.
The first time the backup job runs like a normal backup. In subsequent
backups, files added to the source as well as files deleted from the source are
kept in the backup folder.
The first backup job runs like a normal backup. As each additional backup
job runs, files are added to and deleted from the backup folder. The backup
destination folder is always the same size as the backup source folder.
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