in my analysis, there would be no problem with that since the REPOSITORY created by the DESIGNER will also be recreated since the owner of the said repository(including objects) will be included during import unless if the owner is SYS. this is because SYS objects are not recreated during import.
by the way, i read in an article written by one of the ORACLE gurus which states that the SYSTEM schema were being retrieve during import. but, just to make sure i believe we have to validate it.
go for cold backup
otherwise u will not be able to restore the whole data
because 3 days before i got the same problem
copy your datafile ,controlfiles,logfiles as well as init.ora
and paste at the same place(means the path shoul be same)
and startup your database