I have bitcoin-qt running on online computer. I want to:
- copy blockchain to offline computer (preferably using WORM media for security reasons)
- from time to time update offline copy with newest blocks with smallest effort. Smallest effort means - among others - that I don't want to re-record whole blockchain from online computer to media every time and would prefer incremental copy instead.
The main obstacle that I encountered until now was that - sometimes - when I updated bitcoin-qt on online computer, the 'blocks' directory was wiped out. Then whole blockchain has been re-downloaded, preventing me from copying new blocks incrementally (because for some reason new blk*.dat files had different size/content then previous).