How many is 1L?
Why are you using workspace copy? (c.f. rule 3 of http://wiki.apache.org/jackrabbit/DavidsModel)
What are you trying to achieve?
your tar indexes seem corrupted. Stop your server, back everything up, remove index*.tar, start the server again (but you should first answer the questions below in order to see if you're on the good way).
Mmm, i guess that if you're using CQ, your application is more or less related to WCM :-), so you have content and scripts?
Is this the whole content (business content + rendering scripts) you want to branch?
Do you want to use your several branches through CQ, or just the last one?
The next question i risk to ask you from your answers (no suspense then) is : couldn't you have each branch in separate nodes of the same workspace? (which makes sense if you don't use update/merge apis)