Fedora "back in time" back up software & surveillance video

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http://forums.fedoraforum.org – I currently use Back in Time to automatically backup my data to other drives. I have only used in on data that doesn't change while the backup is in progress. What I want to know is how this software would act when it meets a video stream that is currently being saved to? How would Back in Time backup a videos file that is continuously getting bigger due to the fact that it is being saved to from surveillance cameras? Thanks, (HowTos)