My main survival world has become corrupted and my most recent backup is three weeks old (I know, I know).
I know the trick of copying the level.dat etc. files but that hasn't helped. Every time I get near my base (which is in my spawn chunks - this may or may not be a coincidence), Minecraft crashes. So far, going elsewhere has been fine. I was nowhere near my base when the save was corrupted.
The problem with this is that 90% of what I have done that I care about is at my original base.
I have a backup but this is missing a couple of things I care about. I built a wither skeleton farm (I'd already slabbed the area some time ago so at least I haven't lost that - that took me weeks) which I was really pleased with. I don't actually need the wither skulls as I have several stacks of them but I was chuffed with how well it worked. I had also cleared a large area of ocean and was building a (so far rather unsuccessful) creeper farm. The farm was nothing to write home about but it takes ages to clear ocean, even with sponges.
Is there any way I can splice the two saves together somehow or is my only practical option to use my backup and try to cheat the missing projects back in. I wouldn't regard that as cheating as I've already done the work and it's not my fault it was corrupted but it's still a lot of work.
You could try opening the corrupted world with MCEdit (better to use 1.0, not the 2.0 beta, which may still be unstable), which is more forgiving than Minecraft when loading corrupted worlds (FWIW, copying level.dat will not fix issues with corrupted chunks, which this likely is a case of) and may even be able to copy the data to a backup.
Also, do you have any crash reports, which may be able to pinpoint the exact problem? For example, if it mentions something about an entity you could use MCEdit to delete it and possibly recover the world without doing anything else (if you can find the exact location you could just delete that one entity and not do a more general wipe, which will delete everything within the selection, including mobs, armor stands, paintings, item frames, etc). If it is a mislocated chunk MCEdit may still recognize it properly (as an experiment I once used NBTExplorer to change the location of a chunk, which caused a "world hole" in-game along with a bunch of "wrong location" errors, yet MCEdit showed the chunk as being in the right place - as well as a copy at the new location. I fixed it by simply changing the coordinates back to the proper location but the copy might overwrite another chunk).
Thank you, I shall have a look at MCEdit. I don't normally use a Windows PC although I do have a Windows 10 laptop that I use about twice a year. I shall dig that out.
If it doesn't work quickly though, it's probably less effort to re-create what I lost in creative mode. The only other occasion I cheated anything in was when a guardian glitched between glass blocks and killed me while I was AFK and I lost a whole stack of sponges, which weren't easy to acquire. Clearing the ocean will still probably take me a couple of hours and the same for re-creating my wither skeleton farm but at least I know doing that will definitely work.
It's a bit of a pain in the **** but it serves me right for not keeping a backup. I used to backup every couple of days but my world is 5GB and it's a bit slow so I got out of the habit of doing it.
I'd just like to point out that those asterisks are not mine. I have no idea why I cannot say ****, since it's a proper English word that I would quite happily say in front of a five year old child or my granny but it has clearly transgressed some stupid rule.
Oh, no. That's terrible, Lotus. This is one of my greatest fears with Minecraft as my hobby. My sympathies.
I went to Ritter_Kaldor (on TMC's advice, if I remember correctly) in his Corrupted Save Recovery Thread on March 5, 2016. He was very helpful. Very fortunately, it looks like he is still active, so he's the guy to see.
To save you both some time, tell him two things: the version of Minecraft in which you started the world and the version in which you last played when posting. Make an archive of your world folder and upload it to Google Drive or Dropbox or whichever cloud service you prefer and give him the link. I PM'ed him mine. Tell him the coordinates of problem areas (which just sounds like spawn chunks). He is not an English native, so be concise.
Best of luck. Please update this thread with the outcome.
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I didn't have time during the week to do anything about this but now I've managed to fire up my Windows machine (and install a million updates, virus definitions etc.) and install mcedit.
My corrupt world opens in mcedit fine. I have very little idea what I am doing with this but since I have a backup that isn't too old, I shall simply try to copy the relevant bits from my damaged world to the most recent backup. It's a fairly large pain since I have never used mcedit and it's pretty slow on my old laptop but this should be doable so thank you for the suggestions.