expert told me that the best way to download an application is by using torrent.

I would like to upload an application (2 Gb) to an online-backup-site (I 7 zip it to a folder).
If one day I would like to download it, will it pose me a problem? because it happen to me a lot that when I am downloading
a big zip file, it eventually downloaded as a 'break file'.

There are very few sites that have the ability to let you download applications by torrent. Legal software that is. But for things like Linux .iso's, it's ideal.