Cutback edits are saved per sequence.
All changes are saved automatically while you work.
If you open the exact same sequence in Premiere Pro, your edits will be restored.
Unsaved or unexpected shutdown?
If the project was closed without saving, subtitle edits may not have been stored.
Recovery is unlikely in this case.
Check Premiere Pro auto-saves.
Premiere may have autosaved versions of your project.
Try locating and opening one to recover your work.
Accidentally clicked Apply to Sequence?
Use the Time Machine button at the top-left of the Cutback menu bar to revert.
Important Note:
If you have used the time machine feature, there is no direct way to revert to the previous state.