Start with regularly tested backups and frequent database integrity checks. You should be running integrity checks often enough that it's caught before ending up in the backups. Or, if there isn't a large enough maintenance window, restore the backups to another server and CheckDB that.

Second, brush up on restore options. A 1TB database is probably in multiple files/filegroups. If the corruption was isolated, you should have been able to restore just the affected file/filegroup. Usually a lot faster than restoring the entire DB and if you have SQL enterprise edition, the restore is 'online' (rest of the database is online and usable). Depending on the extent of the damage, you may have been able to do page restores, restoring just the corrupted pages.

Once that's in place, then start looking at HA/DR that support your SLAs.