I use google's DropBox. It free and works great.
https://forums.garmin.com/showthread.php?t=24346&highlight=dropbox
I have Basecamp (for Mac) loaded on my iMac desktop and also on my MacBook Air. I create waypoints, routes etc. on my desktop and load them onto a Montana 600 which I use on my motorcycle. When on long motorcycle trips, I carry my MacBook Air, so I want Basecamp on my MacBook to have the exact same user data as I have on my desktop iMac. To do this I have been selecting File/Backup on the iMac and saving the backup file of "My Collection" on my desktop. I then use the Air Drop function to wirelessly transfer that file to my MacBook. Typically I have saved that file to Downloads on the Macbook. I then go into Basecamp, select File/Restore and choose the backup file in the Dowmloads folder. Today when I tried to do this, the Backup file was greyed out and I could not select it while in the Restore operation. I next tried saving the Backup file to the Documents folder on my MacBook and it too was greyed out when I tried to choose it for the Restore operation. Any idea why this might be and what I can do to restore my Basecamp data on my MacBook using the Backup file from my iMac? Could I have inadvertently done something different this time around?
I use DropBox for syncing BaseCamp. Never had a problem and I have been through about 6 updates of BC. The MBP is always in sync a few seconds after connecting to the internet.
The dropbox works great for syncing here is clarification if you are like me and only visit the terminal when double click fails.
My home directory is pseabolt and my dropbox is in my home directory. Below it the terminal output. I added the numbers for line identification.
1. MBPro-7:~ pseabolt$ cd ~pseabolt/Library/Application\ Support/Garmin
...
4. MBPro-7:Garmin pseabolt$ ln -s ~pseabolt/Dropbox/BaseCamp
5. MBPro-7:Garmin pseabolt$
Line 1 changes directory to the garmin directory.
...
I ... corrected the syntax in Line 4 and basecamp is happy.
See the links in the post above for more information on setting up the sync and a app to eliminate the terminal commands.
... Anything in the Dropbox folder is backup by Google and I share my Dropbox folder with three computers. If I make changes on the MBP, as soon as I connect to the internet, Google syncs to my other computer and makes a backup. I don't think the rsync command would be anywhere close to being as simple.
I have one BaseCamp data folder synced with 3 computers and backed up by google. If you use BaseCamp on two or more computers, dropbox is the best solution, in my opinion. The backup is a nice extra feature, you can access your DropBox files from a web browser and Dropbox lets you undelete files that were added to it. You could also undo any changes made to a document and restore it to its previous version.
I think Marcopolo99 interest in Backup was to sync BC data between two computer.