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Forum Discussion
Choice of file system for external backup hard disk
Hi,
I have used my ReayNAS 314 for a few years and run the latest OS on it. Regularly I make backup on an external HD of the important part of what is stored on the NAS. I have two external bac...
I use BTRFS on my USB devices. I like that because I can snapshot by data on the USBs. It is fantastic for backup versioning, for example.
Hopchen wrote:
I use BTRFS on my USB devices. I like that because I can snapshot by data on the USBs. It is fantastic for backup versioning, for example.
I assume you are doing that yourself (from ssh), since the built-in backup jobs don't have that facility. Is that correct?
- Yup that is correct. I wish that was a feature in the NAS admin panel. I have a cronjob that does this for me :)
Thanks for the comments but I like to sharpen my questions.
The reason for me to make both external HD to be BTRFS is that I "imagine" that since the NAS is on BTRFS then if backup is also on BTRFS then I get a slightly higher degree of safety of data integrity, compared to having the external HD as EXT3 (or EXT4)
The drawback is you put all eggs in the same basket, so to speak. But I guess by now BTRFS on ReadyNAS has matured and I have had no problems these years I have used it. But I have not tested it much though.
So is here a gain in data integrity by having the external HD in BTRFS, however small? Or there is too many other sources of corruption anyway so it does not matter. After all I have an ordinary NAS and not the one with special RAM-memory to protext agains data corruption there.
What do you think?
janpeter1 wrote:
So is here a gain in data integrity by having the external HD in BTRFS, however small? Or there is too many other sources of corruption anyway so it does not matter.
The only gain I see is that if BTRFS checksums are enabled on the external hard drive, then you could detect that files stored on the drive became corrupted later on. I'm not convinced that happens often enough to worry about - it's certainly not something I've ever seen on my own NAS.
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