Here's Sandra's question:
I do copy my "working" RootsMagic file several times a week to Dropbox, but do not sync any of my Dropbox files with the file folders they came from. This way I can import the most recent file into RootsMagic on my laptop, and it's a cloud backup. I use Dropbox to save my important files and to transfer files to/from my desktop, laptop and mobiles (photos, files, etc.).
For your problem:
* Make a copy of your first file (File-1) to use this as the basis for the combined file. This is File-3.
* Make a GEDCOM file of the second file (File-2) to import into the copy of the first file (File-3).
* Open File-3, then do a File > Import and import the File-2 GEDCOM. Select GEDCOM from the list of the importable programs and then "Combine into this database."
* That will put duplicate persons into your File-3.
* Then go to Tools > Merge > Automatic Merges and check "Smart Merge," "Source Merge" and "Repository Merge." Click on "Begin Merge"
You can go back to File-1 and File-2 if it doesn't work and try something different.
For some reason, RootsMagic doesn't allow a user to File > Import an existing RootsMagic 4-6 file into a File > New file.
3) I just did this with one of my files (File-1, with 86 persons) - made a Copy of the file (File-3) and a GEDCOM (File-2) of the file. I then opened the Copy (File-3) and imported the GEDCOM file into it. It created duplicate persons - 175 total. I then ran Tools > Merge > Automatic Merges and ended up with a file with 92 persons. It did not merge some persons that had a first name, no surname, and no birth or death data. So it's imperfect, but it did most of them. If that happens to you, you should go through your person list and manually merge those persons.