Save a title and save your place
The heart button adds a production to My List. A checkpoint is separate: on a series page, choose the season and last episode completed, then save it. You can keep different checkpoints for several editions of the same television format.
Create the backup
Open My List and select Create backup. Copy every character from the backup box, including its opening and closing braces. Keep that text somewhere you can retrieve before you clear the browser or replace the device.
Restore without starting over
In the other browser, paste the text into Restore backup and choose Merge backup. Recognized titles are added without creating duplicates. An existing checkpoint stays in place, so importing an older copy will not move it backward.
When a backup is refused
Check that you copied the complete text and that it came from this WatchSeriesHD site. A different site’s list or a manually edited fragment may not match. The message beside the restore controls tells you whether anything was added or skipped.