Restore a database from yesterday

Restore a database from yesterday

OK, so I knew not to mess with live data, and I thought I backed it up by copying the form, but that didn't copy the data.  So when I editted the name fields in a radio button list, all of the data that was the original name is now blank.

Armitage was editted to 2: Armitage, so now all of the records that had Armitage in that field are blank

Not sure if it is hidden or lost, but guessing the data is lost.

So the question now becomes is my data backed up anywhere.

I did not make a proper back up, wondering if the system does anything?

Thanks in advance for any help or daylight you can shed on this.