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hippy-
File recovery freeware found the activity files, but they were corrupt and I wasn't going to find any data to extract from them.
Performed a factory reset, hopefully it'll be capable of saving rides again. I suppose the safest way to get any data backed up will be to Bluetooth it to Strava on my phone as soon as it's saved, unfortunately, given that this is a Garmin, that only seems to work about 25% of the time.
Jon.
After having a relatively trouble-free history with Garmin for the last 5 years my 520 has started deleting activities of it's own accord.
Last week, when stopped at a cafe, I switched the unit off to save some battery, when restarted everything was lost. Today I split the ride into a few sections and saved both, only to find once home and with the Garmin switched back on the activities have disappeared.
Anyone had luck with file recovery software with Garmins?