1) what you mean by 1/1 ?
2) can you contact that one person freezing your server, to ask what he did, and see if he can reproduce the problem at will ?
3) searching could be the problem. Searching is not indexed in HFS, so it's a very heavy task. Try disabling it in the template (there's an option at the start of the template), and see if the problem disappear.
4) to backup, save your options to file. You'll get an "hfs.ini" file. Backup that and the .vfs file.