Is Skydrive and Google Drive of any help against file infectors?

hiya folks, not sure which sub-forum to place this in so apologies if its incorrect.

i was researching the cryptolocker malware (which is frightening alot of people) and i just had a bit of a brain wave.

lets say a a user is using skydrive and/or google drive and they get hit with some sort of file encrypting malware like cryptolocker. wouldn't both the aforementioned cloud sync services infect the data stored in the cloud if left to upload without interruption?

if the above situation is possible, is there anything we could do to prevent it from happening? obviously aside from remaining infection free

 

The best thing I can do:
1. No syncing. If I wanted to upload my files to the cloud, I'll do that manually. It's time for the cave man in action.
2. Have multiple backups of your backups of your backups of your files.

 

i suppose there is no way round it for cloud sync users apart from setting both services to not 'start automatically with windows' and instead just run the sync process manually but not forgetting to close the program once it finishes uploading.

 

They usually sync the newer files, which is bad if it's infected. They might also have AV scanners, not sure how it'll affect the files. There may be a way for one-way syncing from the cloud, but I wouldn't know how.