There is a bug in sarab that prevents using several rotation schedules (which is necessary if you have several archives). I reported the problem upstream but given the lack of maintanance in the past year I do not expect a quick response. I don't know if it is necessary to replace the gentoo ebuild but I'll attach a modified ebuild and the patch.
Created attachment 76144 [details] Modified Ebuild
Created attachment 76145 [details, diff] Patch for sarab.sh
Thanks. I included your patch and change to the ebuild in portage.