What saving a title actually does
My List records the title you selected. A backup carries that reference and manual episode checkpoints. Neither stores the film, a soundtrack or subtitles for offline playback. The saved poster is a reminder, not a downloaded movie.
Use the viewing application's download feature
Where supported, download through the service that supplies the film or episode. Availability can differ by title, plan, device and country. Some services offer mobile downloads without offering the same feature in a browser.
Before travelling
Check that the download is complete, the preferred audio and subtitle tracks are included, and the application can play the episode. Inspect any expiry period. Keep enough free space for the rest of the journey instead of saving more episodes than you expect to watch.
Carry the choices separately
You can keep a portable text backup of your BingeWatch list even when video downloads are unavailable. Restore it in another browser using the backup instructions. Use the watch-time calculator to choose a realistic number of episodes for the trip.