Backups not working yet status says they are working

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kenalker1 wrote:

I have been using the built-in Rsync feature to back up my ReadyNAS (firmware version 6.10.4) to a directly attached external USB drive for a number of years now.  I get nightly notices via email from my ReadyNAS indicating "Successfully completed backup job nightly rsync of data folder."  However, nothing has been written to my external USB drive in over two months. 

This is a known bug with rsync "push" backups in 6.10.4 and 6.10.5  No idea why Netgear hasn't addressed it (perhaps JohnCM_S should make sure it is on their fix list???)

Since you are using "push" backups (backing up from a local source to a "remote" destination), you can either downgrade back to 6.10.3 or you can switch to using "pull" backups.  Though you need multiple backup jobs to use "pull" (one for each share).

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kenalker1 wrote:

...but my ReadyNAS is 100% full (but see next paragraph). 

 

When I say that the ReadyNAS is full, I'm looking at the output of the "df" command (from an ssh session) which shows 20G available with 100% use.

You should expand your storage!  BTRFS behaves very badly when it runs out of free space - particularly when it can't allocate space for metadata.  Your volume is at risk. After you expand it, I suggest running a balance from the volume settings wheel.  (I don't recommend running a balance now - it likely will fail).

FWIW, df isn't a good tool for exploring disk usage with btrfs.  "Free space" is a rather complex subject with btrfs and zfs. There are some tools built into btrfs that give better information.  For instance, btrfs fi df.