Updating from Win 10 TP build 9926 to build10049 will destroy linux partitions

hi, i have a grub2 dual boot test system sucessfully running on a 128GB SSD drive with two OS:
Windows 10 Technical Preview x64 en-us build 9926 on one 64GB partition and
Ubuntu 14.04.2 LTS Desktop x64 en-us on the last part of 64GB (GRUB Boot Manager Partition, ~48GB EXT4 root partition ,16GB SWAP partition)
everything was running well side by side.
then i tried to update Windows 10 technical preview 9926 to build 10049, by the Windows update (Settings -> Update & Recovery).
during the Installation (after first boot to initiate the Installation 0%..20%) the "updater" was creating an additional ~500MB hidden WinRE partition, unfortunately by overriding the Linux partitions GRUB boot Manager partition and parts
of the Linux ext4 root partition.
PS.: booting is a BIOS based one (not UEFI)
Questions:
any idea, if it is possible to restore the Linux partitions (the parts that wasn't touched by the WinRE partition)
how to prevent destroying existing Linux partitions when i try to redo the Installation and updating next time.

Questions:
any idea, if it is possible to restore the Linux partitions (the parts that wasn't touched by the WinRE Partition)
update to 1.:
only ~20% dataloss, i could rescue ~80% of the data, stored of the broken Linux Partition with use of a data forensic tool.
so not a big deal, it was a test environment, but only annoying, that Windows has broken the Linux partitions without any warning.
PS.: maybe it would be better, if Windows would not steal diskspace from other existing non Windows partitions.
a better practice would be keep all partitions untouched, that is not involved by the win 10 update and shrink only the Win10 partition that is to being updateing by the ammount needed for the WinRE partition and only re-arange the partitiontable
entries (add to primary or extendend table).
so no data loss may occure - maybe the grub boot Manager will be a bit confused, but that can be solved easely.

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