I know this question has been asked in the more distant past, but I
would like to get the latest views, as relevant to backuppc 4.x
I have my TopDir on a btrfs filesystem which has file-level
compression capabilities (using the mount option -o compress=lzo for
example).
I can do either:
1. Cpool with no btrfs compression
2. Pool with btrfs compression
3. Cpool plus btrfs compression (presumably no advantage)
I would like to understand the pros/cons of #1 vs. #2, considering
among other things:
1. Backup speed, including:
- Initial backup of new files
- Subsequent incremental/full backups of the same (unchanged) file
- Subsequent incremental/full backups of the same changed file
2. Storage efficiency, including:
- Raw compression efficiency of each file
- Ability to take advantage of btrfs extent deduplication for 2
distinct files that share some or all of the same (uncompressed) content
3. Robustness in case of disk crashes, file corruption, file system
corruption, other types of "bit rot" etc.
(note my btrfs filesystem is in a btrfs-native Raid-1
configuration)
In the past, it seems like the tradeoffs were not always clear so
hoping the above outline will help flesh out the details...
Looking for both real-world experience as well as theoretical
observations :)
_______________________________________________
BackupPC-users mailing list
BackupPC-users@lists.sourceforge.net
List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki: https://github.com/backuppc/backuppc/wiki
Project: https://backuppc.github.io/backuppc/
