February 2022 • Macworld 23

Y

ou can keep an ongoing

deep backup of not just

your start-up volume

with Time Machine but

any qualifying drive you connect to

Time Machine provides easy access to mounting a backup of a volume

that’s not currently plugged in. Glenn Fleishman reports

How to find a Time

Machine backup for

an offline volume

your Mac. The provisos? It has to be

formatted as HFS+ or APFS, and

cannot be a Time Machine volume.

But what happens if you don’t

always have one of your external