I find it incredibly easier to configure and run periodically in a cron job. Plus I've never had even the slightest stability issue with gmvault whereas Thunder

I find it incredibly easier to configure and run periodically in a cron job. Plus I've never had even the slightest stability issue with gmvault whereas Thunderbird (which I use anyway to read emails at work) has bad days from time to time. Additionally, the output format (gzipped plain email + metadata) looks very convenient for indexing / analysis; something I'm dreaming of for a long time.