limit number of backup files

Gnucash defaults limit of backup file to days instead of number of files, so if gnucash is opened for several hours, there could be many backup files. Is there a way to limit the backup of files to a number of files instead of days? So I can specify I want to keep 5 backup files instead of 3 days of backup files (that could end up to few hundred of files in 3 days!!)