don't worry about import duties. i'm in the UK- not sure where you are. use the download option which won't attract import duties. BIAB's download manager is simple and foolproof. start it before you go to bed and regardless of how many files you need they'll be ready in and installed in the morning.

i'm a dedicated pessimist so was worried about it not working but its bullet proof

and don't worry about backups. PG Music retains your files on record so you can download again.