When backups have been saved with a time stamp in the file's name and a suffix, in the case of more than one backup in one day.
sort_backups(file, f_timestamp = "%Y-%m-%d", fext = ".rda")
A data frame including the sorted names of backup files from the oldest to the newest.
A character value indicating the root of the backup's name. It may include also the path relative to the working directory when the backup is stored in a sub-folder.
A character value indicating the file extension (including the dot symbol).