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As it is possible to program a ATtiny45 using Arduino as ISP Programmer, is there a way to backup an ATtiny45 program to a .hex file using Arduino?

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You'll have to use the commandline for that. Inside the arduino program folder there is another executable called avrdude. You need to call something like avrdude -pattiny45 -cstk500v1 -Uflash:r:filename.hex:i –  Gerben Oct 9 '14 at 16:27

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Assuming the lock bits on the device haven't been set, sure. Simply prepare the Arduino for ArduinoISP, hook up the ATtiny45, and perform a read using AVRDUDE instead of a write (-U flash:r:foo.hex:i).

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Thanks! I'll try it later! –  Alfonso Jiménez Oct 9 '14 at 10:01
    
Sorry, totally missed your mention of that. –  Chris Stratton Oct 9 '14 at 15:31

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