To be fair, this latest outage is probably linked to the DDoS. The only to combat that kind of attack is literally to increase the number of servers - which being physical etc is a tall and expensive order. It also means as new servers come online, the site probably needs to be "down" for a while.
I'm all for blaming LJ when its something their fault like the stupid fiasco last year but this isn't their fault now.
Having said that, I think it is a good idea to back up LJ anyway. Which means its another job for me to do this weekend! Hmmph.