If you mean you placed it in the recycling/trash, then you can still get it out. If you mean you started a new save file, overwriting your old one, then it's a bit trickier.
If you played the new save file and choose a character and started reading a chapter, your old save file is gone forever.
However, if you didn't start a new route and never read any chapters and didn't customize any clothes, bought any items etc. then your back-up save file might still be intact.
Only switch to your back-up under my instructions.
1. Open the location of your Tailor Tales folder and browse to this location: Tailor Tales > www > save
2. There is a file in there called file1.rpgsave and that is your main file. Rename it to something else, such as "file1_old.rpgsave".
3. There's another file in there called file3.rpgsave and this is your back-up file. Rename the back-up file to file1.rpgsave to set it as your main file.
4. Open up the game and load your manual save file; you should now be running from your back-up file. that's only if you don't see your old save file/progress