Backup tool fot ZFS with all "classic dump(8)" fetatures -- what should I use? (or is here any way to make dump -L works well on large FFS2+SU?)

[Lev Serebryakov]

Hello, Freebsd-stable.

  Now I'm backing up my HOME filesystem with dump(8). It works
perfectly for 80GiB FS with many features: snapshot for consistency,
levels, "nodump" flag (my users use it a lot!), ability to extract
only one removed file from backup without restoring full FS, simple
sctipy wrap-up for levels schedule, etc.

  On new server I  have huge HOME (500GiB). And even if it is filled
up only with 25GiB of data, creating snapshot takes about 10 minutes,
freeze all I/O, and sometimes FAILS (!!!).

  I'm thinking to transfer GOME filesystem to ZFS. But I can not find
appropriate tools for backing it up. Here is some requirements:

 (1) One-file (one-stream) backup. Not directory mirror. I need to
     store it on FTP server and upload with single command.

 (2) Levels & increment backups. Now I have "Monthly (0) - Weekly
    (1,2,3) - daily (4,5,6,7,8,9)" scheme. I could afford other schemes,
    but if they doesn't store full backup every day and doesn't need full
    backup more often than weekly.

 (3) Minimum of local metadata. Storing previous backups locally to
     calculate next one is not appropriate solution. "zfs send" needs
     previous snapshots for incremental backup, for example.

 (4) Working with snapshot (I think, it is trivial in case of ZFS).

 (5) Backup exclusions should be controlled by users (not super-user) themselves,
     like "nodump" flag in case of FFS/dump(8). "zfs send" can not
     provide this. I have very responsible users, so full backup
     now takes only up to 10GiB when all HOME FS is about 25GiB, so it
     is big help when backup is sent over Internet to other host.

 (6) Storing of ALL FS-specific information -- ACLs, etc.

 (7) Free :)

  Is here something like this for ZFS? "zfs send" looks promising,
 EXCEPT item (5) and, maybe, (3) :(

   gnu tar looks like everything but (6) :(

-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>