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You should rotate your repositories and avoid pruning until next main release is launched. Recommended procedure is to avoid pruning and rotation of repositories, just change the repository base folder name with some dynamic date stamp to rotate repos.
(c)XSIBackup-DC 220.127.116.11 will be released sometime before the end of October 2020 with a highly improved pruning mechanism.
(c)XSIBackup-DC 18.104.22.168 has been released, --prune action is now faster and can handle a virtually unlimited amount of data.