I've got rdiff-backup up & running nicely using cron jobs over SSH between two VMs (my webserver and a backup space), using scripts put together from various places online.
I'm backing up various folders, including database dumps, /etc and /var/www. I've noticed that the script uses the
--backup-mode for the webroot folder, but not for the others.
Can anyone explain what this option does? All I can find online is the man page which doesn't shed much light on things:
Force backup mode even if first argument appears to be an increment or mirror file.
I can't find any mention of what 'backup mode' is anywhere else.