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This would already be true if there is no yyyy-mm-dd signature in the file name, because files will be sorted by modification time. In case when we do have yyyy-mm-dd signature we want to sort by it first, and then by modification time second.

The way it is going to work is by creating a directory within a backup directory and move files into folders.
We need to have a list of directories that would have backup files copied to and the name of backme directories (backme by default), that will keep saved files. The directories to organize would have files
to deal with (one or more) that will be recognized by regular expressions.

We are making the following subdirs:

recent --- from today and yesterday (keep all files)
last-month --- from less then 31 days old (keep the most recent file for every day)
2018 --- keep most recent file per each month
2017
2016 etc.

Sometimes, if disk space is not a big deal, it makes sense to keep files marked to delete on disk. It also gives a peace of mind when using the app for mission critical backups.

it is quite possible that there is more than one backup event per directory. In this case different files can be distinquished by a variety of patterns, and their deletion and placement into directories should be independent from each other.