Carbonate for me.

I'm in the middle of a complete backup/restore of ALL my data from my 'pseudo' server to an new desktop. It does take a while, but I like knowing all I have to do it step over to the newer 'pooter & I'm back in business. Well, except for 'new' stuff. But that doesn't take long, as Carbonite will now just back up/restore the new stuff.  Just be sure you can retrieve AND use the back-ups. Because Lacerte uses five/six different files per client, it gets a bit tricky.  I'm not familiar with PS's file structure.