document portability of mariabackup/innodb

from: https://dba.stackexchange.com/questions/310745/does-mariadb-10-5-mariabackup-support-data-interchange-between-cloud-arm64-and-l

We're launching project with in-cloud and on-premises phases.
ARM64 cloud pricing is attractive; our on-premises is AMD64.
We want to use Mariabackup for inter-site data migration.
Clear supported or not statements are difficult to locate.

Can anyone point out relevant on-line resource or support statement?