Ever heard of version control and backups? (Score 1)

If you really want retrievability, consider using version control and doing nightly backups. Version control for the stuff you actually change (instead of just create and delete), and backups for everything (including your version repositories). It's far more robust than just a silly trash can.

Sure, a trash can might save you from silly typoes in an rm command... but it won't save you from editing mistakes or file overwriting.