Just tried Soul Caliber on my PS3. It works but I think I might wait a few more weeks until JB and BM is improved.

I used the patched psfreedom.ko for power kernel posted in this thread.
Then used PixelJunk Monsters Demo stealth version of backup manager.

Game launches fine but when it tries to install its update, it downloads the update without issues but it fails to install the update. If I skip the update, game does launch and I can play single player wihtout issues. Maybe other games work fine with installing updates?

I wish it had auto shutdown feature once backup finishes.
I also would like it to show how much disk space each backup is using.

Anyways, I recommend you to have 2 harddisks. 1 clean and one with BM installed. I've read that you can have multiple hdds and switch between them without issues. (as long as they are initialized from the same ps3 unit) BM is installed on the hdd and I believe there is no trace on the ps3 itself if you boot it up with a clean hdd and without jailbreaking.