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It's worth checking the documentation/knowledgebase because I have a recollection that there are only a certain number of keys supported by McAfee.
In fairness, I would expect the DataTraveller to be one of them, so it may have something to do with it's size. Ultimately you may need to raise a ticket with support to clarify this.
Things I would consider myself, if I were in you shoes would be to either try re-formatting the key before trying it again, or trying another key. As I understand it the DR backup shouldn't exceed 2Gb in size and I think you'll find all of the listed devices are 2Gb or smaller, so again my suspicion may fall back to the fact that you're trying to use a larger-than-needed device.
Sorry - scrub my mumblings about the size - your 4Gb drive should be fine, as far as capacity is concerned, but I have found the following in the manual:-
Selecting a USB drive
Your USB drive must meet the following requirements:
• Supported USB drive sizes are 1 GB, 2 GB, 4 GB, and 8 GB. The USB drive must be large enough to
hold the configuration and patches. In general, a 1 GB USB drive should be sufficient for most
firewalls. Configurations with large home directories might require a larger size.
• Your USB drive must be formatted in MS-DOS.
• The firewall USB port must be enabled in the BIOS settings.
Thanks Phil, I removed and reinserted the USB key and it recognised it and did the backup, very strange!
I am also getting the same error. For years, we have been using a 1GB PNY drive without issue. Recently, we have started to receive this error. I know there is approximately 400 MB available on the thumb drive, and from what I understand, the new backup should overwrite the old one. Are there other causes for this error besides there not being enough space for the back up?