<p>My schema involves a 3 step process. The local files residing on the client, local backup on the WHS and online backup. I use Dropbox for the core files which I want on all of my computers. Picasa for my photos as I love it's software and it's simple sharing methods. I am testing Humyo vs. Nomadesk at the moment for the files I don't want to lose, but don't need immediately. This all supplemented by CrashPlan Central and Backup to the external HD. </p><p>I am trying to use no more than 2 syncing services per file type, and have had good luck so far. At the moment At the moment I am trying Oops Backup which is a Time Machine like software. It is fast, graphically appealing and "original". I know it's overkill, but after nearly losing my wedding and honeymoon pics I am being very cautious. I love, but don't depend entirely on WHS.</p>
1) yes, there is such a thing as too much backup, but you're so far from it I wouldn't worry about it
2) the one serious comment I have is that I think your setup is too complicated; it must be a nightmare to manage. For backup, I stick to a local copy, a copy on WHS, and a single copy offsite. BTW, I consider Picasa to be a photo sharing service rather than a backup service. I feel you should be able to retrieve any of your backed up files from the same service/location. If you want to be super cautious, you could use an external HD in addition to the local, WHS, & offsite copies; something like an IOsafe should work well.