Prepare sequences in your Avid application before exporting them as AAF files. If you are working from tapes, log and capture to Avid in a manner that will allow the online editor to easily recapture media in Backdraft Conform. You should also be able to edit in Avid using file-based media.
You can load AAF files using the Interchange commands and either capture the source material from tape or relink the media to files.