Backup your database

Moved to Database Backup and Restore Commands.

Backup the XWiki WAR

Moved to Back Up an XWiki Instance.

Configuration files

Moved to Back Up an XWiki Instance, which lists the configuration files to save.

Custom filesystem Skins

Moved to Back Up an XWiki Instance.

Backup Permanent Data

Moved to Back Up an XWiki Instance, which covers the permanent directory.

Backup Log files

Moved to Back Up an XWiki Instance.

Using the XWiki Export feature

Moved to XAR Export as a Backup Method.

Restore your data

Moved to Restore an XWiki Instance.

Tips in case you are using nginx

Moved to Restore an XWiki Instance.

Sample Backup Script

Moved to Automate a Backup with a Shell Script.