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While Time Machine in macOS 10.15 Catalina still can’t back up to a directly connected APFS-formatted drive—only to one formatted with the older HFS+ filesystem—you can back up over a network to most volumes that can be shared, including other Macs.

There’s a semi-hidden feature in the Sharing preference pane that you can set up:

1. On the destination Mac, open the Sharing preference pane.

2. Click File Sharing Service, or check its box if it’s not already turned on.

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