With unsupported backup methods, there are two options:
The rescue system prompts the user to manually restore the files. This scenario is the one described in "Basic ReaR Usage", except for the backup file format, which may take a different form than a tar archive.
ReaR executes the custom commands provided by the user. To configure this, set the
BACKUP directive to
EXTERNAL. Then specify the commands to be run during backing up and restoration using the
EXTERNAL_RESTORE directives. Optionally, also specify the
EXTERNAL_CHECK directives. See
/usr/share/rear/conf/default.conf for an example configuration.