Quote:
Originally Posted by Tanjamuse
I only have a laptop, and a SD card ...
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Tanjamuse 
Sorry - I have no idea where the thought you wanted to backup to another computer came from - maybe it was something theducks said or didn't say
I suggest you use a usb drive - flash thumb drive or HDD. In which case you could use a file synch tool (like Free File Synch) to backup the entire library - once you have created an initial replica then in future it will only copy changes. A 1TB usb3 hdd is about the same price as a 64GB thumb drive.
And you might want to use the same thing for your other data - photos, music, documents, etc.
Free File Synch ==>>
http://sourceforge.net/projects/freefilesync/
Don't run any file synching tool like FFS whilst calibre is running
BR