I reverted to saved when using an iMac programme and lost data. How can I go back say 24hrs to how the system and data was then?

Lost a tune I was working on in garageband by reverting to saved.

Welcome to Apple Support Communities
Do you make backups of the data? If so, it is possible to recover the file you had 24 hours before, but if not, you cannot recover it.
If you have Time Machine, the only thing you have to do is to go to the folder where you have the GarageBand library with the projects (usually, "Music"). Then, open the Time Machine app, navigate to a backup made before which contains the project you want to recovery, choose the file and select "Restore". See -> OS X Mavericks: Restore items backed up with Time Machine

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