>>    But! You can configure data retention in Syncthing, so deleted files
>> get into .Trash-like folder first.  It could be restored.
>
>     OK: looks better like this; otherwise it would be pretty dangerous!
>
>     This requires a policy: everything you want to keep, you must move
> to other places; and delete the rest. And this method must be enforced
> on both sides. I'm thinking of it and it isn't easy to set up this
> policy, but it would be usefull to have one instead of the current mess (~:

Maybe I could have been clearer. I was trying to emphasise that
synchronisation means that although your data is in two locations, it
would be unwise to think that means you have a backup. As Tomasz pointed
out, Syncthing does have a Trash folder but I personally wouldn't use
that as an intentional backup. I have never had problems with data
corruption with Syncthing. I use Syncthing as described for my photos
and then also have a separate backup policy (copied to a remote server,
etc) for all my data should it get corrupted, accidentally deleted, or
subject to fire/flood locally.

>>
>>     I love Syncthing and I really recommend it.

+1