Restore is copying the data files. See if you can copy the data files. If so then copy then to the hard drive or another floppy.
If you cannot copy all the files then determine which files are bad. The index files such as iac2.dat and ipa2.dat can be rebuilt. Other files can have the data corrected such as changing the tranactions or changing the Account names or payee name. The Asset & Liability info and budgets can be corrected for the accounts.
A list of the files is contained in the help file and in the manual. Most data problems can be corrected.

As always have several good backups at different intervals is good insurance. Your data only exists on your machine. It is the most value thing you have on the hard drive.