Can QubesOS read a external drive of a prior QubesOS install?

I’m going pull the existing SSD drive and then install Qubes on a new drive.

I want to copy files from a standalone Qubes that was on the old install.

Can the new Qubes OS read the now external SSD drive with the old Qubes OS and the standalone Qube in particular?

Thanks.

Why not use QubesBackup? I have found it useful on more than one occasion when I have had to migrate things.

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Yes, it can. This is documented here

Attach the SSD to the new Qubes installation.
Open a disposable, and ensure it has adequate space for the purpose: I
suggest you make it offline.
Attach the relevant volume to the disposable, using qvm-block attach
Decrypt the partition containing the old Qubes install.
Mount the Qubes partition in the disposable.
Find the private volume for the standalone (under /dev/qubes_dom0)
Mount that volume.
Identify the files you want.
Either copy them to a directory in the disposable, and qvm-copy that
directory, or qvm-copy them directly to the qube where they will be
used.

It takes longer to read these instructions than to get this set up.

I never presume to speak for the Qubes team. When I comment in the Forum I speak for myself.