Deja Vu backup now button

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http://askubuntu.com – How do I start a backup on Deja Dup. The "backup now button is greyed out. However, I have set the destination as "Netbook-Backup/Linux Backup". There is now sufficient spare capacity available. I HAVE CRACKED IT!!! A reboot is required after setting up the backup. Why is it not stated anywhere (HowTos)