i use this tool:
https://www.linux-tips-and-tricks.de/en/backup/
every night I make a full backup of all 4 Raspi as a TAR file to a NAS on my network. then i shrink and convert the TAR files into an IMG file (read Framps Linux-Tips-and-Tricks).
so I can always make a new SD card with my Win10 and Win32 Disk Imager.