(1) If necessary, you can always backup files at a Command Prompt with Xcopy or even with Notepad.
(2) Yep, great news that a clone of the D630 worked on the Lenovo, (even taking 15+ hours yow). If you can get that to work on the E6530, you'd only have to restore file backups & reinstall apps. And when all is working well, make a system image backup or new clone.
(3) "this experiment also points to the original E6530 HD having some sort of problem WRT Windows Boot Manager since the cloned D630 with Windows 7 works on the Lenovo and the original problem HD that was in the E6530 moved to internal to the Lenovo boots with a Windows Boot Manager failed screen 0xC00000001 error code."
That sounds right to me. I wonder, can DFsee be used to "backup, backup, backup" items from the D630, then restore them to the E6530...?...
http://www.scoug.com/os24u/2001/scoug012.dfseetutorial.html#:~:text=To%20do%20this%3A%201%20We%20start%20the%20program,anything%20you%20want.%20...%203%20Press%20enter.%20
DFSee -- A Tutorial For OS/2 Users
But it does sound like a perilous task to do. I guess I would want to try the VBRs of the IBM BM partition & possibly the Windows partition. Then I guess the MBR. And maybe the "spareblocks" whatever those are.
(4) But you still get that "No physical..." error when trying to boot the clone of D630 in the E6530. Did you make it the internal drive & try it through the normal BIOS boot menu (you report only trying F12)?
You used to get it when trying to boot a Win 10 Installation DVD in Legacy mode. Devices did boot in UEFI mode. And there is that "DOS based one" that does boot.
(I have a "DOS based" Seagate DiscWizard rescue CD that too would boot at a time when other DVD/CD's would not, including UEFI. But I only vaguely recall the cure. And I never got that dread "No physical..." error. I think what I did was to delete Dell's preinstalled boot menu option for DVD/CD in BIOS Setup (F2 for me). That one used to show up with F12 even when no CD/DVD was inserted. After deleting it in BIOS Setup, a new one shows up only when a DVD/CD is inserted pre-boot, & it does work.).
On original E6530 HDD, when using F12 (BIOS boot options menu), you said...
"Right now no DVD/CDs will boot (except a DOS based one) under the Legacy Boot Options hitting F12 on BIOS screen and in fact booting anything HD, DVD/CD or external USB all get the 'No physical...' message when trying to boot (except the DOS based one). The Macrium, Hiren's, Win ISO and Win recovery all boot under UEFI boot on the F12 option menu."
And when booting normally (BIOS boot screen)...
"IBM Boot Manager did work until this problem. Now, if I enable it the behavior for both Win 10 and eCS is the same. Selecting either the screen goes black for a second and then reboots to the BIOS screen. But making Win 10 startable and active and trying to boot gives the "No physical.." message."
You got various other errors on the Lenovo but never a "No physical..." error. You got the "No physical..." whether booting to the HDD (though maybe only when Win 10 is Startable) or to other media. That is why I tend to think it is a BIOS problem. Do you see anything different in the BIOS settings of the Lenovo compared to the E6530? But you did get boots of eCS & Windows that went to the brink when booting through IBM BM, so it may be the VBR or its ilk that is at fault.
But now, the new clone (OMG, 15+ hours), gives the "No physical..." message when trying to boot it under F12 Legacy Boot Options. I think you said you made it internal. Have you tried booting it through the normal BIOS boot menu?