Angsuman, thanks for your kind reply. I found an easier (for me) way to backup the db, since I'm not at all familiar with shells or any of that. I was surfing around my hosting site; I went to CPanel, which had (surprise!) a big button labeled "Backups." Ha! Then I chose the aptly-named "Download a MySQL Database Backup" option. Click. All done. Now that's "db Backup for Dummies"! :-) Thanks again, though, for trying to assist me.
I'm posting this not only to say thanks, but also just in case it can help someone else who comes along reading this thread and can use this option. Best wishes. :-)