Advise on mixing 2.5.x clients , 2.4.x clients and a 2.4.15 Urbackup server?

Hi there,
I would like to ask for some advice.
I have a 2.4.15 Urbackup server which needs to stay on that version for a while due to several reasons. So I wonder if it is advisable to update all the Urbackup clientes (CBT and Linux clients) from 2.4.11 to 2.5.19 step by step over time? This would result in a mixed environment of 2.4.11 and 2.5.19 clients with a 2.4.15 server. Are there any constraints or reasons not to do so?
Thanks in advance for some hints!

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I don’t think the 2.5.19 are backward compatible with a 2.4.15 server. I tried it but the client couldn’t connect.

But I might be wrong, and just the client acting up.

Thanks for your feedback
So I will not dare to upgrade my 2.4.11 clients to 2.5.x. as long as the Urbackup server has to stay on version 2.4.15.