NewTek TriCaster 855 - Manual (Page 131)

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The backup operation feature will determine whether all media used in the session is local (i.e.,
located in folders named for that session), or whether some content is external – stored in other
places on your system, and included in the session using Add Media Location, or from folders
belonging to other sessions. If all session media is local the backup proceeds without further
interruption.
When external media is used in the session, a dialog is presented stating "The following files are
external to the session. Would you like to import these files?" The optional actions in the dialog
are:

Backup without importing

Import and Backup

Cancel Backup