Device works ok by now. But having his age in mind, internal (Dallas?) battery dies one day. As I understand at least CAL data would be lost, or maybe some other problems would arise?
Bearing this in mind I would do NVRAM backup. The questions are:
1) how to backup it the simple way? Or any way if simple way do not exist?
2) how to restore it from backup?...
Any other suggestion to do to ease self life in case of device failing?