*guesses*
we all download a copy?
It would be useful backups to be of known provenance to give confidence in their authenticity.
- us each having a differing random subset of 365+ GPX files would be hard to piece back together to the whole story, and attest they really are his
- exporting from Strava looses the HRM (and temperature and power etc etc) data.
Simplest thing could be to do the uploads via Garmin Connect and rely* on the Garmin-strava linkage to automatically get them into Strava. Then it's in two places at least. (And has plus point of being fully automatic upload with Garmin 1000 + smartphone running garmin connect, and also reduces the need to ever have to type Strava password into random host's PC)
* - that's the rub with this approach...
-or-
periodically go into
https://www.strava.com/settings/profile and click "Download all your activities". When the archive link is sent, go ahead and download it and save a copy in GDrive, github, dropbox, memory stick, whatever.
EDIT: this is not such a good choice either, as it also uses GPX file and looses the HR etc data
(see comments here). This
ongoing struggle to get a decent export from Strava is exactly why I'm nervous of any workflow that treats Strava as the Source of Truth for my own data. Backing up the .fit files at source probably is the winner.