If we exit when tar fails we may not get to backup whats after it.

Thanks to Psi-Jack for picking it up

Document version upgrades

Document version upgrades

Added --backup-upgrade option to upgrade data

Fixed up messages displayed a bit

Fixed bug reporting tar exit status
Use lchown not chown when chowing on restore
Don't chmod & utime for symlinks
Fixed UNKNOWN displaying in the logs insted of ERROR

Improved exclusion of directories

Updated requirements

Cleaned up commandline args & config args