In any given session, your download may total into the gigabytes. This takes time, and there is always the chance of a network failure occurring. While less likely, it is even possible that time constraints may force you to interrupt the session yourself.

The time already spent has not been wasted. As long as you do not move the destination folder in the meantime, FTProofsheet has the ability to pick up where you left off.

To do this, start the download again when network service is restored. When FTProofsheet detects that target files already exist, it will ensure that they are complete. If so, it just moves on to the next. If not, it will finish them from the point of the break.