It's not foolproof, but is far better than in "the bad old days". A Journalling File System keeps a record of all write actions waiting to be written to disk, enabling the system, on rebooting, to rebuild any files that weren't correctly closed. This used to be a huge problem years ago, before "journalling" file systems were invented for hard drives. An unexpected power loss causes the file to be left in an 'open', indeterminate state, where the program can no longer access the file because it was never 'closed' correctly.
This generally occurs when a program doesn't actually 'close' a file (such as a game save) after writing to it, but keeps it 'open' to save time when it next wants to write to it. Hopefully this is something they can fix to make doing this unnecessary. It is unfortunate that the saves become corrupted if the game closes suddenly without exiting properly.
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