Unpack nextcloud/backup returns [object Object]

While trying to recover after a SD data corruption, I am stock at the unpack step of restoring point with nextcloud/backup app via occ.
occ $ backup:point:unpack 20230414001554-full-psxxxxxxxxO
System doesn’t fail nor returns success, but instead:
[object Object]

which tells me I am not calling this function correctly but no idea what is wrong or missing.
Also tried:
occ $ backup:point:unpack -- 20230414001554-full-psxxxxxxxxO