Although I haven’t tested DropBox, I’ll urge caution anyway. I would encourage manually running Tools > Verify & Repair before each session of database use, and afterwards. I would recommend running the Backup Archive script after verifying the database at the conclusion of a session, and storing the archive on the last-used computer.
As a practical matter, your Internet connection is going to be a lot slower than the read/write speeds on your hard drive. You don’t control Internet traffic, nor the remote servers involved in transmission of data from one of your computers to the other via DropBox. I won’t go into issues of error rates. Or speculate on the business model for DropBox and whether or not it will survive over any given time period.
So there can be a latency period – which may vary for a number of reasons – between the time you close your database on one machine, and can load a fully synchronized copy on your other computer. If you shut down the source computer before it has transmitted all your data, DropBox can’t properly handle that. If you then start work on your other computer, you may run into database problems.
The faster your Internet connection and the smaller your DT Pro database, the less likely that it may be that you encounter serious problems. But from a quality assurance perspective, I’d have less confidence in copying from one machine to the other via DropBox, than in a direct copy via Ethernet or WiFi from one machine to the other, or running the database on a portable hard drive moved between the computers; there are additional variables I can’t fully assess or control.
Before I moved to my log cabin in the woods, I had a 15 mbs fiber optic broadband connection. If I still had that, I might experiment with DropBox. But now I’ve got a satellite connection, nominally 1.5 mbs but often much slower, with frequent dropouts because of weather conditions. A few weeks ago, I lost my Internet connection for 4 hours on a clear, sunny day. I called tech service and was told the the problem was caused by bad weather at the upload site in Texas. See what I mean about variables?
Yes, I too dream of instantaneous, error-free and secure cloud computing. It’s certainly not here yet, at least for me.
Just be cautious, run the Verify & Repair procedure often and keep external backups. And yes, always close your database so that memory is flushed to disk, the database is properly closed and the database isn’t locked.