I've got a 2 TB external USB drive that I used for storing stuff, like Files, Music, Videos etc all on a Win 10 System.
I thought I needed the drive for a Synology backup in an emergency. So I formatted it as an Ext4 whilst connected to a Synology.
In the end I didn't need it for the Synology.
Can I use TestDisk to get all the files and directories back?
Or would PhotoRec be best?
It's not the end of the world if I can't, but it's good practice for when I really need the information

Cheers.