External Drive Reformatting - Journaled

Hi all.
For about the past 3 months, I've been backing up my MacBook via Time Machine to a 1 TB external over USB2. Nice and easy.
With Apple recently updating their AEBS software, I decided to connect said 1 TB external to my AEBS and see if wireless backups were possible (as I personally had some doubts as to the reality of that scenario). Now with my external connected to my AEBS, I am constantly receiving the following error message when my scheduled TM sessions run:
+*Time Machine Error*. The backup volume in not in MacOS Extended (Journaled) format, which is required.+
*So my question(s) to the forum...*
Can I transfer my backup data from my 1 TB external to another drive, reformat the 1 TB external as Journaled, then move my backup data back to the newly Journaled 1 TB external so that Time Machine recognize the backup files (aka: continue backing up where it last left off - all previous backups intact)?
Or will I have to start all over again with an initial (and new) Time Machine backup, loosing all previous TIme Machine backups?
Thanks.

Scott Robinette wrote:
Thanks V.K.
I too thought it was formatted Journaled (not sure why i would have formatted it any other way) and will have to investigate this eve as I'm away from my MacBook at the moment.
And Interesting to learn that wireless & wired backups are stored differently. Despite the message about reformatting, maybe attempting to backup wirelessly to a drive containing backup files that were generated via USB2 is causing some sort of hiccup?
it shouldn't. i really don't know what the problem is. it might be that there is a problem with the file system of some sort. plug in the drive directly and repair it (repair disk not permissions) with disk utility. see if it reports any errors. in any case, reformat should fix fix all such issues.
Again, more investigative work to follow.
Thanks.

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