Me and some friends set up a realms server two days ago however, today we all started experiencing server crashes that would revert all the progress that we made. Nothing in partiular seems to cause the issue (like players logging in) it just occurs randomly and how far back it seems to reset is at least 15+ minutes although we haven't measured just how far it goes back.
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Avoma
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This appears to be a duplicate of REALMS-4224, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.