Here is an example of how you can set up a back up system for a Drupal web site with Drush. Daily backups are kept for a week, after which they are deleted, and the weekly, full backups are deleted after 30 days. This script comes with no warranties of any kind, as always, test thoroughly before using it.
To zoom pages by default in Firefox, open the about:config page via the location/address bar, and change the value of layout.css.devPixelsPerPx to fx 1.2, to zoom in 120% on all pages by default. This will also increase the size of icons and tabs, but this way you don't need an add-on for larger text on all web pages by default.