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 Backup
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To backup a horde environment, these items need to be considered:

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 Config files
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As of Horde 6, it is sufficient to backup the var/config/ folder.
You may also want to safe the SSL certificate files and the vhost config of your web server.
You should also safe your composer.json and composer.lock files.

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 Database backup
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Backup your SQL and NoSQL databases using the applicable technologies.
In case of mariadb and mysql it is also useful to safe the database server's config files.

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 IMAP server
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Backup your accounts on your imap server. This is usually outside the Horde administrator's responsibility. However, a webmail client like horde/imp is perfectly capable of trashing your logged in user's mailbox.

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 Local filesystem
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If you use the virtual filesystem, i.e. for email attachments, ansel photo gallery or gollem file manager, you need to backup the VFS tree. 
The recommended path for VFS in Horde 6 is the var/vfs/ subdir of your root project but admins may configure different locations. Consult the config file in var/config/horde/conf.php
::

 $conf[vfs][params][vfsroot] = 

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 LDAP server
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If you use LDAP for authentication or for addressbook storage, ensure a regular backup exists. This is usually outside the horde administrator's responsibility.