Back up iPhone contacts: iCloud, a VCF file and a checklist
How to back up iPhone contacts with iCloud, a VCF file you keep and a computer backup, what each method protects, and how to check the backup really works.
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vcf
VCF or CSV contacts export: which file keeps what you need
VCF and CSV both export your contacts, but they keep different things. What each format holds, where each one breaks, and how to restore safely.
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