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One of the most frustrating things to me is when I'm working hard on something in an application and say all of a sudden it just decides to crash for whatever reason or we lose power right in the middle of something and so Blender has a number of different things that help protect you and help you be able to recover from that kind of situation. And I would like to go over them in this video. There are a couple of different ways. First of all, let's talk about undo and redo, and pull down your User Preferences settings, and click here on Auto Save, and click here on Views & Controls, and click here on Edit Methods.
Here, in this tab right here is the Undo function and Blender can save a whole bunch of different undo steps, 32 is by default. So each time you do something-- Let's say I'm going to move this cube. Then I drop it and Oh! What did I do that for? I don't want to do that. Then just press Ctrl+Z. That undoes whatever that is and then also I can do Ctrl+Y to redo that action again. Like, oh No! No, I really did want it over there. So I just press Ctrl+Y, and it goes back to where it was.
By default now, an unlimited amount of memory is going to be used to save anything done anywhere within Blender. So that's the first thing, undo and redo just from short simple mistakes. Now, for a little bigger mistake, click on Auto Save. Let's say I have been working in a file and all of a sudden, I lose power. Well, Blender has what's called Auto Save Temp Files, which means that in the magic place on your hard-drive it's going to save out a copy of the Blend file, in this case, every 5 minutes.
So I'm never really going to ever lose anymore than 5 minutes worth of work. If for example we lose power right in the middle of something, all I need to do is go out to my Operating System Temp folder. Now, depending on the Operating System, this Temp folder could be located anywhere. In Vista, it's kept in a very magic secret place that's not even really shown to you, which is really kind of annoying, but under Users and then your name of your user there is a hidden folder called AppData for some bizarre reason.
So you actually have to click in the Folder View there, and actually type in \appdata and then this folder is revealed to you. If you double-click and drive into this Local, you will find a Temp folder. If you drive into that Temp folder, you will find two files. One is the most recently saved copy of whatever changes you have made actually here within the last 5 minutes. The other thing that happens is every time Blender quits, it writes out a quit.blend file.
So if I for example, just in a heat of passion, I just get really disgusted and then I just go Hey! Quit. And I quit out of Blender, all I need to do is double-click on that file, and whatever I was last working on, it's saved in that very same state. On a Mac, the Temporary folder is kind of hidden as well and at the Header menu, click Go, Go to Folder, and type- in /tmp in the name of the folder that you want to go to.
When you click Go, the Mac will reveal that there is actually a private folder on your Mac hard-drive and in that folder is the Temp folder. Here we have been rendering at a sequence, so here is all the JPEGs that we have been rendering. Then down here is the quit.blend file that you can use to resume your last session when you last quit Blender. The other thing that happens if you are a Maya user or something like that, a complicated scene can take a half an hour to load or save. Blender has a very, very efficient file structure and writes out the memory to disk very fast.
So you can actually do 5, 10 minute saves even on very large files. It doesn't take that long to load and save these files. Every time I do a File > Save by the way, I don't overwrite the last version. What happens is if I save this file out based on the number of versions I have specified here, and I'm going to go ahead and go to my Exercise Files and look here under Modeling. Okay, here is an example.
I was working on this Arms-Complete file, and every time I did a File > Save, what happens is Blender doesn't overwrite that file. What it does is it takes that file and it copies it to blend1, and if there was a blend1, it copies it first to blend2 and so forth. So you have this kind of trickle down theory of blend files that in this case, I'm going to save up to 5 versions. So I'm going to have a blend, which is the last save, a blend1 which is the save before that, a blend2 which is the save before that, the blend3, and the blend4, and the blend5.
So I'm going to have 6 files here that provide file-level or incremental save backups. Let's say I do some work in this file here, and I save it and I do some more work that just totally messes it up. I can just go in here and just reopen this blend1 or blend2 file. They are formatted exactly the same, they are actually just a blend file, and I can just actually double-click on them, or just use the File > Open command to just open them up as a regular blend file, and then pick backup from that point.
Also, Blender helps me out with the recent files. So when I do like File > Open, if I come down here with my little selector, it's going to show me the ten most recently last used files that I have used. Blender also can save a preview image of the blend file based on of what's in the scene. Most of the time, if after I have been working and I want to go back to my last like say work of 5 minutes ago, Open Recent sometimes can find this file and open it up.
Now, another location to find these Temp files was over here under File Paths, you have a Temp folder specification to say where the Temp folder is. In this case c:/tmp/. So sometimes too files get thrown in there that you can then use to reopen. So those are the several manual and automatic ways that you can set up to make sure that Blender saves your work on a regular basis and prevents any loss of data, or loss of work because of crash or for whatever reason.
I really like to always save when I have made some sort of a major milestone, and I have got into a known steady state.
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