Wrong answer!
If I e.g. start with "home=X" option, I want my home saved.
It would be much easier if you put in an "home/" entry.
I can not imagine that someone starts up with a dedicated home and doesn't want his data saved.
So home/ would cover tc and others. There is no space wasted.
etc is a different story. A lot of config files are stored there (alsa,udev,fstab,group,passwd,hosts, you name it)
At least I am not sure which application puts its "volatile" config files in there.
Perhaps it is worth to think of at least some imporant files that go in there. I do agree that putting all of them in
might be a bit of an overkill.
Perhaps the TCE installation process can take care of it, by putting the relevant config files in filetool.lst.