At this point maybe it needs to be considered whether a small donation could be asked of regular members which would allow the website owner(s) to purchase remote backup of the whole website on a scheduled basis ?

But on a different server or whatever appropriate way to minimise any chance of a recurrence - lightning sometimes does strike in the same place twice.

In the meantime I just hope that a more recent backup will emerge and that this old one can be overwritten as it really has little value now....