NewTek TriCaster Advanced Edition User Guide - Manual (Page 68)

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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