To piggyback on cstone... One of the first things you could/should do, is once you have transferred your files, run your preferred virus program to check everything for viruses, removed any software you don't want (more of an issue with pre-packaged Windows stuff), etc., is make clean, initial backup image of your machine to store on a device not-your-computer.

This way, you can back it up if it ever needs to be completely started over from scratch. Then, make backups of your data as you go along (say, once a week or after anything epic in its importance).

http://osxdaily.com/2012/05/23/creat...ac-hard-drive/

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Was the support guy from Garmin or an Apple tech?