Try makeing a Folder in the C drive, name it what ever you want like- SQLBACKUPS
then try to do the backups into the folder so it shows as:
c:\SQLBACKUPS\Arcadia.bak
For some reason I ran into the same problem. It doesnt like to right to C:\ directly. So I just made a folder and then placed the backup into the folder.
Just Checks Out.. " c:\SQLBACKUPS\Arcadia.bak " track . if ther is eny Unremover BackUpFiles....
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.
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Remove It..& Try to Backing Up aGin Ur DataBeses..