iCloud Backup

isa-isa Said:

"So if I delete the last backup i will still have all my passwords? Thats really the only thing Im worried about. Will there even be any noticable change?"

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Make Sure they are in Keychain:

As long as you've been using the same device, and all is setup in Keychain, then all is set.

Go Here: View the information stored in a keychain on Mac - Apple Support

isa-isa Said:

"iCloud Backup: Will my autofill passwords be deleted if i delete my last icloud backup?"

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No. Because they are currently being used, by your current use of the device.