[X4U] Any concerns about tarring a user account?

[Joshua Hough]

Hi, I'd like to temporarily hide a single user account by moving it  
into a tar file.  My questions are:

1. Later I'd like to untar the account and restore it exactly as it  
was.  Are there any cautions about this?  Such as permissions?

2. How can I password-protect the tar file?  I don't see any  
possibilities under "man tar."

Thanks,
-Josh