(Qt)-Backstep.py is commandline and graphical (Qt) backup software written in pure Python. It can back up any directory to CD-R(W), DVD-R(W), USB key, or another directory. It is a continuous backup solution. It works like a time machine. It contains a backup network server. It can send backups over the Internet or your network.
Libchop is a set of utilities and library for data backup and distributed storage. Its main application is chop-backup, an encrypted backup program that supports data integrity checks, versioning at little cost, distribution among several sites, selective sharing of stored data, adaptive compression, and more. The library itself, which chop-backup builds upon, implements storage techniques such as content-based addressing, content hash keys, Merkle trees, similarity detection, and lossless compression. It makes it easy to combine them in different ways. The ‘chop-archiver’ and ‘chop-block-server’ tools, illustrated in the manual, provide direct access to these facilities from the command line. It is written in C and has Guile (Scheme) bindings.
SafeHaven provides a new approach to backup. The basic idea is to store contents away once and forever. No two copies of the same contents will be saved by SafeHaven unless they are presented in two different formats, and even then, SafeHaven attempts to be as smart as possible, and will recognize the most common formats, including compressed files, archives, and ISO image files.
Neembuu Uploader is an application that uploads files simultaneously to multiple file hosts and lets you manage the download and delete URLs. Currently 12 major hosts are supported. Users can simply drag and drop any number of files to upload. The maximum number of simultaneous uploads can be set. The links of uploaded files can be copyied and exported. Queued links can be saved on exit for uploading later. Users can change the order of uploads.
Backshift is a deduplicating (variable-sized, content-based blocks), compressing (xz or bz2) backup program. Full saves and incrementals are pretty indistinct other than the amount of data transmitted, somewhat like with "rsync --link-dest" but without the huge number of hardlinks. It also de-duplicates large file content at a granularity of about 2 megabytes on average; there tends to be a unique copy of each file with size less than around 2 megabytes on average.