We have 2 pages:
https://documentation.magnolia-cms.com/display/DOCS/Backup+module
https://documentation.magnolia-cms.com/display/DOCS/Backup+app

ilgun has updated the module; it will be released together with Magnolia 5.5

This said, the backup pages going to DOCS55 must reflect the latest version. (Not yet existing DOCS54 can contain the older versions).

There is also a whoopey Friday session recording around where ilgun shows and explains the updated module.
(see afp://file.magnolia-cms.com/All/Product Development/Knowledge Transfer/2016-09-09-Woopee-Friday.mp4)