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Recommendation: If you can save all the significant information in more than one format, do so. In this case, save at important points as.
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Disk space is a lot cheaper than my time and mental health. A good version control system will also do this for you, but sometimes it is easier to just to Save As and increment the filename yourself (see also sync problems below). I'm paranoid, I tend to have about one per half-hour of work, and often have different versions of a project well into the double figures. So file01, file02, file03 (or fileA, fileB, fileC). Recommendation: You should have at least one file for every stage (pencilling, inking, etc) or for every hour of work.
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Save in stages (applies to any software): Love your technology, but don't trust it. You've learned a valuable lesson but, like many valuable lessons, it comes at a significant cost. I'm afraid the file is probably corrupted and you've lost your work. You've spent hours on a single project, saved it, but when you open it again later FireAlpaca either crashes or it open with empty layers, or only one or two of the many layers that should be there, or like an older version of the file. This question has come up a few times recently, so the answer seems worth preserving.
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