When working in the Sequence Editor, Tascus saves multiple backup copies of a sequence file each time a change is made.
To access these backups, go to File > Import Steps from Tascus XML menu.
This will open up a file browser in the location that all Tascus backups are saved.
Each backup is saved with the sequence name and the time and date it was edited.
When you click on a backup file, Tascus will import all steps from that sequence into the current sequence editor window.