I will be interested to hear the results. Mine wont back up to the desk top via any USB port. If yours works to a SSD, I would like to know what brand and size.
Well, after connecting my S23+ to my laptop, when I go to:
Settings > Accounts and backups > and tap on:
External storage transfer . . . I only get the same screen you were seeing, that shows:
'Backup and restore' - 'No external storage device detected' - 'To back up or restore, insert an SD card or connect a USB storage device, then try again' . . .
and nothing happens!
Even though I disconnect & reconnect the USB-C cable several times to my:
Lenovo YOGA 720-15IKB - 3840x2160 4K UHD Notebook w/ 512GD PCIe SSD
. . . there's nothing to click on. And my phones' also not detecting a storage device!
. . . and same result when I connect to a
Seagate Free Agent external SSD . . . nothing!
. . . until we figure-out how to make the 'backup to external storage device' work . . it'd probably be good for you to do the Google Drive backup, as you can always 'manage' your backups, and delete parts or all of them at a later date (via either your phone or PC).
I've backed-up mine to Google Drive (Google's cloud storage service), and the worst part of it, to me, are the confusing multiple screen views—depending on what you tap on, on your GD phone screens—of the same basic backup info, though in different layouts. As some views/screens, once clicked off of...seem nearly impossible to find again (if that makes any sense).
Moreover, I couldn't tell when the backup was done! . . i.e. — As, again, there was one screen view that showed the backup progress—w/files moving into backup—but once clicked off of . . I could never find that screen again.
A few other gripes I have w/Google Drive . . .
— After first showing that I had 100GB of Google One (which is the additional storage by 'subscription' service . . of Google Drive) storage available (due to my wife's sharing of her 100GB Google One subscription with me), once the Google Drive backup started, it only showed (the standard, free) 15GB available, with no trace or notice of the 100GB of shared Google One storage space (from my wifes' account) — ever shown again!
— And upon starting the Google Drive backup, it showed that I had
"About 4 years of storage left" . . . but then, after only 1.5GB (of my free 15GB) of storage space was filled with the backup, the 'Manage storage' screen changed to
"About 2 years of storage left" . . . then, after only 3GB (of my free 15GB) of storage space was filled with the backup, the 'Manage storage' screen changed to:
"About 11 months of storage left" . . which doesn't make any sense, to me.
— Notwithstanding, on one positive side . . the Windows/PC view of your Google Drive and /or Google One (which is the additional storage by 'subscription' service . . of Google Drive), shows all your Google Drive/Google One backup details, where you can review them and keep or delete them as you wish.