Datastore.Backup
Datastore.Backup allows a user create new backup snapshots and also provides the privileges of Datastore.Read and Datastore.Verify, but only if the backup group is owned by the user or one of its tokens.
I usually set an API token per clientPBS_PASSWORD
When set, this value is used as the password for the backup server. You can also set this to an API token secret.
As PBS isn`t officially supporting ARM SoCs you better ask the third-party-creator that created that arm port.i'm a little confused, if my rpi is running 5.10.103-v7l+ which arm client am I supposed to use (i only see 64bit and i think 5.10.103-v7l+ is 32 bit?)
--edit--
oh i see i am supposed to use the old 1.1.9
Depends...is it better to back up a pi just files or as block device?