Excluding a device from storing snapshot data?

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Hi all,

I'm currently envision a backup setup for my laptop which has a SSD. I
would like to use an external HDD und span a raid1 over these two
devices and also creating snapshots. What I would like to prevent, is
that these snapshots take storage space on the SSD, because SSD
storage is precious, while this isn't true for the external HDD. So I
would need to exclude the SSD device to store snapshot data, or to be
more precise, to store only one specific subvolume. Which can
obviously be changing, if I need to restore a previous snapshot. Is
this currently or actually possible?

Thanks.

Bert
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