Two computers, different totals

I have two different computers with my Quicken account on each. I manually enter most of the information, not relying on regular updates from my bank. One computer has up-to-date information. The other computer, which I havent accessed Quicken on for a few months, is still stuck back on February transactions. I am concerned that if I "synch" that second computer, it will override the new information currently saved in the Cloud from the first computer. How can I get the second computer up-to-date without disrupting over two months of transactions? Thanks for any help ….