My guess would be no. All the documentation I've read about backintime is that it takes a snapshot of your system. So basically it's just a file with pointers of data on your disk. As you make changes to your disk the snapshot grows because the pointers turn into data which was changed using a diff. So if you take away the disk then all of the pointers to files which you have not changed will no longer be there so the backintime snapshot will just be a useless file.
That is if they're using the term snapshot correctly. That's the difference between an actual backup and a snapshot. One is a full copy of data (backup) and the other is a file of pointers to data with only differences stored (snapshot).
I'm currently viewing the source to verify though.
Last edited by sag47; 05-01-2012 at 05:02 PM.