Scott Ludwig and I have released a new version of his python based backup script, Link-Backup. This new version ignores broken symlinks and has an option to ensure that only one backup at a time is going on.
Also with this release is a cgi script (viewlb.cgi) for exploring the backups. This makes it easy to keep tabs on what is going on. Scott wrote this script a while ago and I updated and improved it.
Details here.