I have deleted all the database from
/var/backups folder. but I have a copy of those database in my local hard drive so I copy database and paste in
Now Database is showing in admin but when i try to rollback it shows loading but nothing happens.
Do you have access to your hosting service? Usually, Magento tools (backup, import, export) never works.
I suggest you to use phpMyAdmin from your hosting to import the database. You just go to your database, click Import and select your .sql file. Or, if you have SSH access, you can also do it using this command:
mysql -u [username] -p [database_name] < [dumpfilename.sql]