On Mon, Nov 11, 2019, at 11:34, [email protected] wrote:

> Are you saying that the changes, I don't care about the history, are
> not stored in the db?

The db should have all the *darktable* information that the sidecars have 
(AFAIK the few historical exceptions to this have been eliminated, somebody 
correct me if I'm wrong). If you've used other software to add stuff to the 
sidecars, the db might not have that (externally added keyword tags might be 
ingested, not sure under exactly what circumstances, though).

> This would mean:
> 
> 1. do a DT 2.6 backup to be archived with dbs, configs and xmps
> (therefore also images)
> 2. test on DT 3
> 3. restore the DT 2.6 backup is there's any problem until the xmas
> release

You shouldn't need to backupl the image files (beyond the normal backups that 
you hopefully do). You could just rename all the *.xmp files to *.xmp-26 or 
similar, which should be easily reversible (or purgeable) if you want to use 
sidecars with 3.0.

My guess is once you go 3.0, you won't go back (I don't think I could at this 
point), but I would consider waiting a bit for rc1, since there's been quite a 
few fixes since rc0.

-- 
jys
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