Keep your contacts safe using iCloud & Google Contacts
Keep your electronic phone book update to date with iCloud Contacts and Google Contacts
First, enable cloud contacts following the instructions below.
Second, train yourself to capture and update phone numbers, email address, and other key data when you see it.
Third, remember to download a copy to a secure computer every so often such as on your birthday or one your regular maintenance day.
First, enable cloud contacts
Learn how to set enable Apple's iCloud Contacts to back up and synchronize your address books on your iPhone, iPad, Mac, and even Windows here:
https://support.apple.com/guide/icloud/set-up-contacts-mm2e5b1c6686/1.0/icloud/1.0
Learn how to enable Google's Cloud Contacts to back up and synchronize your address books on your Android phone, iPhone, iPad, Mac, and even Windows here:
https://support.google.com/contacts/answer/2753077?hl=en&co=GENIE.Platform%3DAndroid
Second, train yourself to capture and update
Just do it.
Third, remember to download a copy to a secure computer every so often
Set a reminder.