I think you should be fine, doing everything you described, to migrate your GTREP.
3. If i restore gtrep, No need to create new repository in new server. Please Correct me if i am wrong.
R: Yes, you are correct. You can connect you datamaker directly to the migrated repository.
5. If SQL Server is not installed in Mixed Authentication mode, if I create "sa" account explicitly from SQL Server, will it be fine. Please suggest on this.
If SQL is not in Mixed mode, sa user is probably created, but disabled my MS SQL:
- Open SQL Server Management Studio.
- Choose Windows Authentication from the Authentication drop down list.
- Click Connect to open the Microsoft SQL Server Management Studio window.
- Expand Security and then expand Logins.
- Right-click sa and click Properties.
- Click Status and check the box for Login Enabled.
Note: You may have to give the sa account a password at this time as well.