Xbian copy tool - data only

[mk01]

@all

xbianclone is preserving full fs structure but is of course copying DATA only. that's why final clone (img file) is 1:1 bootable copy functional & data wise exactly the same (of course it doesn't copy older snapshots, just the one actually being booted).

size parameter is from two reasons. to have better control over final img size and then a bit historical reasons - from the times when BTRFS was significantly un-exact at reporting used size on disk (specially with compression turned on). 1st version of cloning tool was playing on safe side, it was creating final clone img of size original partition -500M (the requirement was that created img should be possible to flash back to the same card (or new card with the same capacity - but because sector counts are very much different between manufacturers - even if all for instance are providing capacity like 1T, that's why that -500M. to have reserve space in case new (THE SAME DEVICE) would be in reality a bit smaller).
2nd version of cloning tool was already using the corrected FS usage reports but because until now btrfs doesn't provide tool to report sizes of individual snapshots, the df -h reported occupancy was in maybe 5% difference (so quite exact), BUT if 50% of that was snapshots, the .img was again too big and half empty.

that's why over the versions --size param was always kept and will stay.

currently, the tool is counting exact occupied space by traversing whole filesystem (what is fortunately hell fast on btrfs). that's why it was also possible to implement the % progress bars. (currently IMG size = counted size of source +20%.

@kgoerbig

the backuphome functions will preserve only /home subvolume and finished backup file is available even through samba for download. it is the most optimum (if you don't care system itself) &user friendly as it is completely noobish and drag & drop. you just trigger it and in few minutes you can drag&drop the backup file over to your computer.
then after flashing clean img (or new version) and starting XBian you just reverts the process by dragging the file over to XBian (you don't even need to stop XBMC). if the backup is validated, XBian replaces /home with it and finally will restart XBMC - to repply all the previous settings.