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[FAQ]

You can avoid this by saving the analysis before solving or any action that creates a backup. The backup operation is really just a folder rename/move so you can work very efficiently still as long as you save at the correct times. If you re-run an analysis which generates large result files, the old solver files are placed in the backup directory (in case the user would exit without saving). So if you save before solving, the backup directory is wiped out.