I want to restore a single file/page from the website. I am not sure how to do that.
FREE Backup & Restore Dropbox creates FULL backup, as a result you can make only FULL restore of you website together with all files, database and plugins. There is no way to restore just single file, pages or database.
You can restore from Dropbox or restore from Webserver, depending what type of backup you have.
The guidance how to restore website:
1) navigate Dropbox Full Backup item at your wordpress website admin panel;
2) hit “Restore” in front of necessary backup.
For better understanding, please watch tutorials:
Restore from Dropbox Backup:
Restore from Local Backup: