Happened to me again today, for what it's worth. This time, only one TW had been open during the entire browser session, and I'd just finished saving a rather large tiddler. I clicked into another tiddler, made a minor edit, and then clicked "done" — at which point I got the "Out of Memory" dialog, saw that the backup had been saved, and realized both my TW and its backup had been wiped out to 0 bytes. I tried recovering the TW from the cache (0 bytes) and using "View Source" to grab it before it was too late (empty file), but neither worked. Sadly, I've been on the run this week and haven't made any manual back-ups of this TW (my main notebook), so I'll be spending Friday night trying to reconstruct everything I've lost since Monday morning. :_( — The upshot is that I've just discovered that Tyler Rumkin updated his life-saving BackupOptionsPlugin ( http://rumkin.com/tools/tiddlywiki/#BackupOptionsPlugin) earlier this year to allow for rolling back-ups — meaning that I can now have two alternating back-ups created on save, preventing the heart-breaking loss I just experienced without having to have 200 back-ups trailing behind me. :)
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