>On one specific server, under R2, the compression does not work. This command:
>
>

>BACKUP DATABASE [LevelExtreme] TO DISK = 'D:\Data\Level Extreme\LevelExtreme.bak' with compression
>GO
>

>
>gives this:
>
>Msg 3098, Level 16, State 2, Line 1
>The backup cannot be performed because 'COMPRESSION' was requested after the media was formatted with an incompatible structure. To append to this media set, either omit 'COMPRESSION' or specify 'NO_COMPRESSION'. Alternatively, you can create a new media set by using WITH FORMAT in your BACKUP statement. If you use WITH FORMAT on an existing media set, all its backup sets will be overwritten.
>Msg 3013, Level 16, State 1, Line 1
>BACKUP DATABASE is terminating abnormally.
>
>Is there an easy way to resolve that? When I tested that on two other PCs, it worked.

In the options dialog don't chose append, chose overwrite.