A very simple file backup app. Drop your file on the program icon or select item in context menu (Linux) to create a backup folder where numbered backups of your file will be stored.
BaGoMa backs-up and restores the contents of a GMail account. It can restore all the labels (folder structure), as well as the flags (seen/read, flagged) of a message.
tarlimit will archive a given folder into a series of archives, each of which is no larger than a specified size. Designed for creating backups of large sets of data on media with a size limit, such as DVDs.