I'm absolutely devastated to find that Google Calendar has deleted 5+ years of my past events. I've just downloaded an ical backup lest I lose yet more, but I'm still pretty horrified that the app I've been using as a diary has just lost 2005-2010.
It's happened since December. Search results show it happening to a few people. Suggestions are that a sync'd device is deleting events - but I've had the same phone & calendar app for over a year and this has only just become a problem. In terms of other services - I don't know. I've just signed up to https://spinbackup.com/
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