Well there isn't any bug here, at this point this is a support request. These files exist because they're part of Telemetry, which is functionality that is inherited from Firefox. I think that fully disabling Telemetry (should delete all this data within 30 days)[https://www.ghacks.net/2020/01/03/mozilla-will-soon-delete-telemetry-data-when-users-opt-out-in-firefox/], but it's most likely fine to just manually delete it. In general, we don't support cloud syncing of profile files directly like this and it's entirely possible future projects like (maildir)[https://bugzilla.mozilla.org/show_bug.cgi?id=845952] or others will create problems for this strategy, so I can't recommend it.
Bug 1675781 Comment 6 Edit History
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Well there isn't any bug here, at this point this is a support request. These files exist because they're part of Telemetry, which is functionality that is inherited from Firefox. I think that fully disabling Telemetry [should delete all this data within 30 days](https://www.ghacks.net/2020/01/03/mozilla-will-soon-delete-telemetry-data-when-users-opt-out-in-firefox/), but it's most likely fine to just manually delete it. In general, we don't support cloud syncing of profile files directly like this and it's entirely possible future projects like [maildir](https://bugzilla.mozilla.org/show_bug.cgi?id=845952) or others will create problems for this strategy, so I can't recommend it.