Based on http://unix.stackexchange.com/questions/92346/why-does-find-mtime-1-only-return-files-older-than-2-days
I'm thinking of changing the mtime parameter in the find commands to mmin to have a better selection of files. This would hopefully improve the hourly and daily rotate so not several backups from the same day are saved.
@rossica , what do you think about this?