I'm performing a full backup of a directory with duplicity 0.7.17. Slow I/O is the bottleneck (less than 20 MiB/s read) and the directory is large (~5 TiB).
The full backup was interrupted before it could finish. I've restarted it with the same command and duplicity correctly resumed it from the volume where it had been left, however it's re-reading the entire directory from the beginning. This means I'm not saving any time compared to doing the backup from scratch.
How can I instruct duplicity to only read the "new" directories to save on I/O?
- It's not just reading file metadata: in
atopI see disk activity which can only be explained by duplicity reading the actual file content.
- I'm on fedora 27. The directory is on an ext4 LVM partition spanning 2 virtual SCSI disks on vmware (vmx-10).