backup for upgrade

[coco163]

Wonderful, I was not sure about the usr share and other folders.
Perfect and thank you

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I just installed the new beta2 using the .img, worked very well and i restarted my raspberry with the wizard, all good.
Then I plugged my SD card on my Ubuntu but it can mount only one partition.
Here is the dmesg:

[ 166.285961] mmc0: new SDHC card at address aaaa
[ 166.333980] mmcblk0: mmc0:aaaa SD08G 7.40 GiB
[ 166.337330] mmcblk0: p1 p2 p3
[ 166.917422] Btrfs loaded
[ 166.918665] device label xbian-beta2 devid 1 transid 68 /dev/mmcblk0p2
[ 166.919740] btrfs: disk space caching is enabled
[ 166.919743] BTRFS: couldn't mount because of unsupported optional features (20).
[ 166.932079] btrfs: open_ctree failed
[ 238.232739] device label xbian-beta2 devid 1 transid 68 /dev/mmcblk0p2
[ 238.233840] btrfs: disk space caching is enabled
[ 238.233844] BTRFS: couldn't mount because of unsupported optional features (20).
[ 238.248066] btrfs: open_ctree failed
[ 263.568378] mmc0: card aaaa removed
[ 265.010361] mmc0: new SDHC card at address aaaa
[ 265.010664] mmcblk0: mmc0:aaaa SD08G 7.40 GiB
[ 265.014680] mmcblk0: p1 p2 p3
[ 265.449920] device label xbian-beta2 devid 1 transid 68 /dev/mmcblk0p2
[ 265.455224] btrfs: disk space caching is enabled
[ 265.455227] BTRFS: couldn't mount because of unsupported optional features (20).
[ 265.472055] btrfs: open_ctree failed