A RAID system does not protect you against data corruption or filesystem corruption or human error. It only protects against HD hardware failure.
True.
If you delete a file by mistake, you may still have a copy in the rsync copy -
As you would have a copy in a snapshot [ZFS, LVM, BTRFS].
which may have a photo taken each hour, so you can have several versions of the same file.
This depends, even with rsync it is possible to create a single instance store [with the often overlooked --link-dest=DIR option]. We backup piles of data every day using --link-dest=DIR [referencing the backup from the previous day] and consume stunningly little disk capacity [and the I/O load the backup is massively reduced]. - read snap-dir from previous day - create new-dir - rsync source to new dir with --link-desk=snap-dir - write snap-der as snap-dir - rinse-repeat.
If my data is so important to need a raid, I absolutely must also have an rsync backup. If I can't have both, then it will only be the rsync copy.
Or data on a RAID in an LVM, snap, rsync the snap to alternate storage, drop snap. It is important to distinguish between redundancy [increases availability, aka uptime], backup [time machine'd copies], and archive [safe copies].
It could be designed a system doing the best of both worlds, working like a raid, but one of the sides being always incremental backup type, not a real mirror.
Yep. -- Adam Tauno Williams <mailto:awilliam@whitemice.org> GPG D95ED383 Systems Administrator, Python Developer, LPI / NCLA -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org