Shadow Copy option in Backitup 2

I have been searching the net with little success to find information about the Shadow Copy function in Nero Backitup 2. If someone understands this function I would appreciate being clued in. Nero’s manuals leave many questions unanswered. It sounds like a process that runs in the background but maybe not. Does it work on all backed up files or only files that are backed up while open? Thanks in advance for any responses.

The way I understand it is Nero makes a temporary backup of the files during backup to keep them from being changed during the backup process. I believe they are deleted after the backup is finished.

Thanks for the reply. Several of Backitup’s options are not clearly described in the documentation. I have decided to experiment with some small test backups and recoveries before trusting the app with anything important.