Yes, try a data recovery software such as Data Rescue. You can download a demo to see whether it will recover the file before you buy.
It won't work if you have "Empty trash securely" turned on in Finder's preferences, though - that overwrites deleted files with zeroes.
Buy a disk drive. Use TimeMachine. Put a 2nd partition that you use to clone your system.
Have 2-3 sets of your files: active working files, backup #1 and backup #2
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