Since I'm a newbie, I only had a couple of months of records at CR. Before CR went dead, I printed out my workouts and manually entered them at RA.
If you have a log too big to enter manually, the RunningAhead owner will import your CR log if you request it. There's a thread for that on the main forum page.
The RA log is a bit different than CR, but the learning curve isn't steep. I find the log much more flexible than CR's. Only drawback is you can't print it out (or at least I haven't found out how).
Hope this helps.