Actually, if there was a single partition created using defaults - repeating the same partition creation procedure will "restore" it without even needing TestDisk. The first superblock of EXT3 filesystem is certainly overwritten, but there are many of them throughout the disk. Some of them are usable, no doubt. So the second step would be running fsck to repair the filesystem.
But. If the lost files are really valuable to you, take an image of it (dd utility) before commiting any changes.
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