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The main things you'll want to back up are the contents of directory. parts of the Mozilla suite, and the GNOME and KDE desktop environments) are known to overwrite existing user settings with new defaults when a new version of the application is first started by a user.
As a precaution, you may want to make a backup of the hidden files and directories () in users' home directories.
If for example the initrd is unable to mount your root file system, you will be dropped into this debug shell which has basic commands available to help trace the problem and possibly fix it.This procedure also assumes your system has been updated to the latest point release of jessie.If you have not done this or are unsure, follow the instructions in Section A.1, “Upgrading your jessie system”.This way you can ensure that these critical services are running and available through the full upgrade process, and their downtime is reduced.Although Debian tries to ensure that your system stays bootable at all times, there is always a chance that you may experience problems rebooting your system after the upgrade.