questions about copy project

hi everyone:

i use copy prcject to backup my desin, but i met some problems:

1. in quartus, i click project=>copy project, then copy project1 to a new floder and name it project2

2.i use schematic as top file,

3. in project2, i double click the sub block in the top.bdf, it link to the vhd file in project1

how can i solve this problem?

thanks!