ONLINE DB RESTORE

Hi Gurus ,

I have one problem , Actually our R/3 servers raid controller card failed , Now i installed another controller card successfully , and i restore the offline backup that taken on January month .

After restroring the offline full backup the R/3 server worked fine . Now i want to restore the latest online backup which i tool april 17 th using BRTOOLS . That online backup took by one of the external Harddisk .

So kindly tell me what are the steps i have to take