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MacFly, an incremental backup tool based on rsync and btrfs snapshot

You must use a full device to set a btrfs file system.

• with a an USB device, identify the /dev device

• 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.