For full, incremental, compressed and encrypted backups or archives
...Dar saves *all* UNIX inode types, takes care of hard links, sparse files as well as Extended Attributes (MacOS X file forks, Linux ACL, SELinux tags, user attributes) and some Filesystem Specific Attributes (Linux ext2/3/4, Mac OS X HFS+)
more details at: http://dar.linux.free.fr/doc/Features.html
Xena transforms files into open data formats for long-term digital preservation, encodes content in Base64 and wraps in XML metadata. Formats supported include MBOX, PST, MSG, DOC, XLS, PPT, RTF, PNG, XML, PDF, JPG, TIFF, PCX, WAV, MP3 and more.
NO LONGER MAINTAINED, NO LONGER SUPPORTED
Deprecated! This app was written for ClientLogin which was discontinued. Use something more current, ie "drive" : https://github.com/odeke-em/drive/
PHP Script for automatic backups of your google docs (including google apps) for archival (for those of us that don't trust anyone). Supports multiple document types and folders. Requires only php and php-curl