MacFly, an incremental backup tool based on rsync and btrfs snapshot
You must use a full device to set a btrfs file system.
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with a an USB device, identify the /dev device
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with an iscsi device, login to your target, for instance:
iscsiadm --mode discovery --type sendtargets --portal 192.168.100.7 iscsiadm --mode node --portal 192.168.100.7 --login
--targetname iqn.2012-07.com.lenovoemc:storage.disque-reseau.MacFly -
you can use any filesystem (ext4, NFS, ...) by creating a disk image
qemu-img create -f raw macfly.img 200G
Then create the btrfs filesystem:
mkfs -t btrfs --force /dev/sdX
or
mkfs -t btrfs --force macfly.img
Then find the UUID:
blkid -t TYPE=btrfs -s UUID
or for the disk image:
losetup -f macfly.img blkid --probe -t TYPE=btrfs -s UUID /dev/loop0
Create /etc/macfly and copy config and filter files in it.
Update /etc/macfly/config to set the correct UUID Update /etc/macfly/filter to filter files and directory, you want to backup
Copy macfly-update to /etc/cron.hourly/
You can force the first backup by running /etc/cron.hourly/macfly-update.
Then an hourly backup will be done. Hourly backups are kept during 24 hours, Dayly backups are kept during 1 week, Weekly backups are kept until disk space is exhausted.
