From: ammammata@tiscalinet.it   
      
   there's a backup scheduled daily for many different files   
      
   the related filenames are unique, i.e.   
      
   RSP_backup_2021_02_09_200005_8336305.bak   
   RSP_backup_2021_02_08_200007_8776502.bak   
   RSP_backup_2021_02_07_200005_8652391.bak   
   RSP_backup_2021_02_06_200005_4658428.bak   
   RSP_backup_2021_02_05_200005_1944601.bak   
   RSP_backup_2021_02_04_200005_6798320.bak   
   RSP_backup_2021_02_03_200005_4282408.bak   
   RSP_backup_2021_02_02_200005_0172624.bak   
   RSP_backup_2021_02_01_200005_9353583.bak   
   RSP_backup_2021_01_31_200006_2371866.bak   
   RSP_backup_2020_12_31_200003_2429004.bak   
   RSP_backup_2020_10_24_200004_0066296.bak   
      
   I'd like to delete, about every 3-4 months, all the backups except the   
   lates of every single month, tipically those with date 31/10/20 30/11/20   
   31/12/20 31/01/21 etc   
      
   in the above list you can see I kept current month (feb) and left the   
   latest of each previous one (jan, dec, oct)   
      
   I do this manually, right now it's not a huge tast, using a file manager,   
   but I wonder whether there is an automated solution since the different   
   backups will grow   
      
   TIA   
      
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