Try again the backup, but turn off the enigma2 ("init 4" command), and turn off the Cams plugins in the Enigma2 menu.

Then do the backup, sending the command line command related to the script file .sh in /usr/bin (generally it's script file .sh /hdd).

TS
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DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/