I have looked at the technical specs for BullGuard Internet Security 2013 and, yes it looks like the Spamfilter and Online Backup modules are not compatable with Windows 8.
I have recently contacted BullGuard Live Support - as usual no problem getting through!
The answer is: A BullGuard Backup Standalone version compatable with Windows 8 is hoped to be released as soon as possible; however there are no plans for a BullGuard Spamfilter Standalone version for Windows 8.
Hope that answers your question.
Post Edited (Dickens) : 3/15/2013 8:25:55 PM GMT