What the warning tells you is that you have a large amount of data in a single cell in your database. Generally you can restore that data to the same server, it let you put the data there in the first place, it will let you restore it. But if you restore to another server or host, with different MySQL settings, that large amount of data could be a problem.
The only way to KNOW if a backup will restore is to restore it. We strongly recommend that you test your backups on a regular basis to make sure everything works. You can set up a subdomain on most hosts that will let you do a test restore without affecting your live site. Paranoia is your friend. :-)
Dale L. Brackin
Support Specialist
English: native
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
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My time zone is
EST (UTC -5) (click here to see my current time in Philadelphia, PA)