[MC-71636] the map crash while loading, part of my builds disappeared

as title said map crashes while loading in, parts of my build has disappeared,
it did happen before, but it recover with in 10 secs. This time it last like 6hours already. i really need help, pls help me
is that possible to go back one day on the file saved?

Related issues

duplicates

MC-45009 Inventory and container empty/world corrupted after downgrading to older version.

Attachments

crash-2014-09-12_14.07.20-server.txt

Comments

migrated 2014-09-12T09:27:51Z

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kumasasa 2014-09-12T13:12:25Z

Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]). Please attach it so that we can diagnose your issue.

migrated 2014-09-12T13:21:37Z

just attached the crash report, thanks in advance

kumasasa 2014-09-12T13:34:54Z

Uhm, that crash report is from version 1.6.4, whereas your screenshots are from version 1.8 ?

migrated 2014-09-12T13:47:40Z

i change to version 1.6.4 and the problem begins, try to go back to version 1.8 and problem still exist. Is there a bug when i change versions?? It didnt happen before the release of version 1.8

kumasasa 2014-09-12T14:03:52Z

Wait. You did open that world in 1.6.4 after you had it opened in 1.8 ?
If so, this is a duplicate of MC-45009

migrated 2014-09-12T14:14:19Z

i had the world started at 1.6.4 with a friend, if so this downgrade makes it vanish and not able to recover again??

kumasasa 2014-09-12T14:26:30Z

and not able to recover again??

Yup.

Or you have a backup.

migrated 2014-09-12T14:53:35Z

thankyou for your help, i am repairing and rebuild with a better design 😃
i guess at least i learn the downgrade problem,
oh by the way how do i backup?

kumasasa 2014-09-12T20:05:05Z

To backup navigate to .minecraft/saves/ and copy <WORLDNAME> to e.g. Copy of <WORLDNAME> or <WORLDNAME>-<DATE>