how and where to retrieve an unnamed backup

[L'espion Noir]

i working on this track right
well my bass track was recorded -via midi- half ass ( some notes were recorded shorter than they actually were) why is that?

so i retracked the bass ( it came out like it suppose to)
but then some error occur causing SX to be shutdown when i open it back up i inadvertently chose not to open the backup
so of course i chose to keep the backup
now the mystery, where can i find that backup ?

Thanks