No, never. I've seen too many people and organisations lose years of work and data. I've also seen a large number of backups fail because the backup procedure was inadequate and the backup never tested.
I've never lost a backup but I have restarted a forum in the past because I couldn't move hosts. I know better now that if I'm wanting to make a community, I need to either just stick to what platform I pick or simply pick a platform I can easily make backups on to move if I want or need to.