Data Rec0very with Inconsistent Backups

just lost an OJS 3.1.0 install (disk failure). The database is current to the time it failed, but the files directory backup is from March. I also have a database dump from March.

If I restore the database from March, everything will be consistent but April/May’s work will be lost.

Is that my only option? Can someone help me understand the extent of the damage, i.e. what data have I really lost?