What are the proper xattr in Time Machine folder hierarchy?

Hi there,
this is a highly technical question as I am trying to reconnect a corrupt Time Machine volume to its original Macs, one of them running SL, the other Yosemite.
I tried what Pondini advises on his website, including a migration of the network preferences. When first plugging the TM volume, I get this in the Console:
16/01/15 02:32:12    com.apple.backupd[38751]    Starting standard backup
16/01/15 02:32:12    com.apple.backupd[38751]    Backing up to: /Volumes/TW2/Backups.backupdb
16/01/15 02:32:13    com.apple.backupd[38751]    Detected system migration from: /Volumes/Time Machine/Backups.backupdb/snowy/2014-09-16-141637/Macintosh HD
16/01/15 02:33:19    com.apple.backupd[38751]    Backup content size: 646.7 GB excluded items size: 444.5 GB for volume Macintosh HD
16/01/15 02:33:19    com.apple.backupd[38751]    Starting pre-backup thinning: 242.65 GB requested (including padding), 69.61 GB available
16/01/15 02:33:19    com.apple.backupd[38751]    No expired backups exist - deleting oldest backups to make room
16/01/15 02:33:19    com.apple.backupd[38751]    Error: backup disk is full - all 0 possible backups were removed, but space is still needed.
16/01/15 02:33:19    com.apple.backupd[38751]    Backup Failed: unable to free 242.65 GB needed space
16/01/15 02:33:24    com.apple.backupd[38751]    Backup failed with error: Not enough available disk space on the target volume.
I don't understand how it can detect a migration but still can't delete older backups on this drive to make room.
MAC address
So I followed a rather old link on MacOSX Hints to reset the MAC address on the drive, and now I have:
drwxrwxr-x@   9 cubytus staff
986 15 jan 22:01 .
drwxrwxrwt@ 174 root
admin
5916 16 jan 01:41 ..
-rw-r--r--
1 root
staff
0 15 jan 22:01 .0026b0XXXXXX
-rw-r--r--
1 root
staff
0 15 jan 20:25 .3c0754XXXXXX
-rw-r--r--@   1 cubytus staff
15364 16 jan 01:34 .DS_Store
drwx------
4 cubytus staff
170 19 nov 04:45 .Spotlight-V100
drwxrwxrwt
4 cubytus staff
136 19 nov 04:45 .TemporaryItems
d-wx-wx-wt
3 cubytus staff
102 16 jan 01:41 .Trashes
-rw-r--r--
1 cubytus staff
162570 4 déc 23:27 .VolumeIcon.icns
-rw-r--r--
1 cubytus staff
302 13 déc 14:58 .apdisk
-rw-r--r--
1 cubytus staff
0 4 déc 23:27 .com.apple.timemachine.donotpresent
-rw-r--r--
1 cubytus staff
0 4 déc 23:27 .com.apple.timemachine.supported
-rw-r--r--
1 cubytus staff
785 4 déc 23:27 .disk_label
-rw-r--r--
1 cubytus staff
3149 4 déc 23:27 .disk_label_2x
drwx------@   2 cubytus staff
748 16 jan 01:39 .fseventsd
-rw-r--r--
1 cubytus staff
0 16 jan 02:07 .keepThisDriveSpinning
drwxr-xr-x
2 cubytus staff
68 17 aoû 2013 .prpro.scratch
drwxr-xr-x
2 cubytus staff
68 31 mai 2008 .vol
drwxr-xr-x@   4 cubytus staff
204 16 jan 01:44 Backups.backupdb
lrwxr-xr-x
1 cubytus staff
11 26 fév 2009 etc -> private/etc
-r-xr-xr-x
1 cubytus staff
47712 24 sep 2007 fsaclctl
-rw-r--r--
1 cubytus staff 10310496 9 déc 00:41 mach_kernel
-rwxr-xr-x
1 cubytus staff
115716 9 déc 00:41 tmbootpicker.efi
lrwxr-xr-x
1 cubytus staff
11 26 fév 2009 tmp -> private/tmp
lrwxr-xr-x
1 cubytus staff
11 26 fév 2009 var -> private/var
The MAC address in 3c belongs to the Snow Leopard Machine, the 00 one to the Yosemite machine. I know it sounds weird, but it is unclear how TM recognizes its backup drive. I first disabled ACL with fsaclctl (taken from a Leopard install DVD), and it worked, as said by:
sudo /Volumes/TW2/fsaclctl -p /Volumes/TW2
Access control lists are not supported or currently disabled on /Volumes/TW2.
Made sure the hidden file with the MAC address was correct, then re-enabled the ACLs.
ACLs and Xattr
Since the internal HDD had to be replaced, I wrote the com.apple.backupd.SnapshotVolumeUUID with the new HDD UUID in directory "Backups.backupdb/snowy/Latest":
Latest cubytus$ sudo xattr -w com.apple.backupd.SnapshotVolumeUUID 361B184E-E1FF-3860-95E2-XXXXXXXXXXAE "Macintosh HD"
Then went up two levels and checked the xattr:
Backups.backupdb cubytus$ ls -al@
total 0
drwxr-xr-x@ 4 cubytus staff   204 16 jan 01:44 .
    com.apple.FinderInfo      32
drwxrwxr-x@ 9 cubytus staff   986 15 jan 22:01 ..
    com.apple.FinderInfo      32
drwxr-xr-x@ 14 cubytus staff   578 15 jan 20:39 snowy
    com.apple.backupd.BackupMachineAddress      17
    com.apple.backupd.HostUUID      36
    com.apple.backupd.ModelID      13
drwxr-xr-x@ 31 cubytus staff 1088 16 jan 02:18 Whitebook
    com.apple.FinderInfo      32
    com.apple.backupd.BackupMachineAddress      17
    com.apple.backupd.HostUUID      36
    com.apple.backupd.ModelID      10
And checked their content:
snowy:Backups.backupdb cubytus$ sudo xattr -l Whitebook/
com.apple.FinderInfo:
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0B |................|
00000020
com.apple.backupd.BackupMachineAddress: 00:26:b0:XX:XX:XX
com.apple.backupd.HostUUID: BBD6D268-F58D-5407-974E-XXXXXXXXXXXX
com.apple.backupd.ModelID: MacBook5,2
snowy:Backups.backupdb cubytus$ sudo xattr -l snowy/
com.apple.backupd.BackupMachineAddress: 3c:07:54:XX:XX:XX
com.apple.backupd.HostUUID: 94BE92F5-E652-546C-8B33-XXXXXXXXXXXX
com.apple.backupd.ModelID: MacBookPro8,1
Each computer has the correct addresses and HostUUID, i.e. the current ones.
Yet neither of those give the "Reuse existing backups" shown on Pondini's website, and tmutil on Yosemite doesn't succeed in reconnecting to the backups.
What is the point I am missing?

Hey 2cpd2,
I see that you need help with restoring your computer from a Time Machine backup. Here is an article for you that should be able to address this question for you:
OS X Mavericks: Restore items backed up with Time Machine
http://support.apple.com/kb/PH14111
You can also find more information about using Time Machine here:
Mac Basics: Time Machine backs up your Mac - Apple Support
http://support.apple.com/en-us/HT201250
Thanks for being a part of the Apple Support Communities!
Cheers,
Braden

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