Hi,
Sorry to hear that. But as I say, in the absence of any other information, it’s much more likely that it’s actually your hosting company who have set up their policies to forbid backups, and that no archive-based backup plugin is going to be able to anything about that – and that to do something about it, you’d need to ask the hosting company to not implement such policies. (If you find out that the case is otherwise, we’d be very eager to have more information).
Presumably it does have something to do with the hosting company, as I’m supposing that if something spoiled one site, you wouldn’t be likely to then try it on another three sites, one after the other. So presumably the hosting company has decided to do something with your account and all sites are on one account?
David