Yeah -F should probably work fine (I'm trying it as we speak, but it takes a 
little while), but it makes me a bit nervous.  I mean, it should only be 
necessary if (as the error message suggests) something HAS actually changed, 
right?

So, here's what I tried - first of all, I set the backup FS to readonly.  That 
resulted in the same error message.  Strange, how could something have changed 
since the last snapshot if I CONSCIOUSLY didn't change anything or CD into it 
or anything AND it was set to readonly?

Oh well, so I tried another idea - I had been setting compression to gzip-1 on 
my backup, but my source filesystem had compression=gzip-1 and recordsize=16k.  
So, I set both of those settings on my backup FS (and readonly OFF).  Now the 
only difference between my backup and my backup source should be the fact that 
they have different FS names (datapool/shares and backup/shares), but they 
would kinda have to, wouldn't they?

At any rate, I'm trying -F now, but that makes me a bit uncomfortable.  Why 
does zfs think something has changed?  Am I truly creating a backup that could 
be restored and won't have something screwed up either with some of the older 
snapshots or with the current, "promoted" version of the FS?  If something 
really has changed between snapshots, or the incrementals aren't copied over 
just right, I could end up with my best backup being all corrupted.  (My other 
backup methods, of course, contain only current data, not the whole series of 
snapshots.)
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