for example I see that since 2023-10-16 the file seems to be a different version (v13, I guess there was some update). What happens if I delete the ones before (version 12 and so on)?
By @NCG_CH
Nothing happens, and that kind of house keeping is something you should do regularly. Having a 248 GB backup folder does not make any sense. For a catalog of 150,000 images, a single backup will be around 5 GB or so, meaning that backup folder contains a huge number of backups that you will never ever use. Keep one or two old backups, just in case, and keep perhaps the 5 most recent backups, that will be plenty. And I agree with @dj_paige that you should keep these on another drive, not the same drive as your working catalog. Right now, if that drive fails, you will lose both your working catalog as well as all your backups... In the backup dialog, you can click the 'Choose' button and choose a different location for your backups. Move the existing backups that you want to keep to this folder manually.
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