composer postAutoladDump failed

[thetispro]

With a fresh Laravel 8.10.0 installation

COMPOSER_MEMORY_LIMIT=-1 composer require spatie/laravel-backup
1/5: http://repo.packagist.org/p/provider-2020-04$ee78edc488fcfd137c4e17c188284f4ae01e3b42cf89e9ef62edb8e708fd4d22.json
2/5: http://repo.packagist.org/p/provider-latest$77bc7d615dae433332bd3d9ee70f8c0e10ed64073fcf836af5eee9ba26351492.json
3/5: http://repo.packagist.org/p/provider-2020-01$22f8d9d4baebf6be93f0046df744c8b6e436dc464d862590b3b77d733af3981e.json
4/5: http://repo.packagist.org/p/provider-2020-07$8c1708f51fa8ec7696c9bb098750c6b140977f84ea77206b76a2a04e524dd473.json
5/5: http://repo.packagist.org/p/provider-2019$b5d0863308d304d9d8f24bf15f49da4a2c00bcdeb37ab3b68d20e58656a4c1a5.json
Finished: success: 5, skipped: 0, failure: 0, total: 5
Using version ^6.11 for spatie/laravel-backup
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating optimized autoload files

Illuminate\Foundation\ComposerScripts::postAutoloadDump
@php artisan package:discover --ansi

Illuminate\Contracts\Container\BindingResolutionException

Target [Spatie\Backup\Tasks\Cleanup\CleanupStrategy] is not instantiable while building [Spatie\Backup\Commands\CleanupCommand].

at vendor/laravel/framework/src/Illuminate/Container/Container.php:1017
1013▕ } else {
1014▕ $message = "Target [$concrete] is not instantiable.";
1015▕ }
1016▕
➜ 1017▕ throw new BindingResolutionException($message);
1018▕ }
1019▕
1020▕ /**
1021▕ * Throw an exception for an unresolvable primitive.

  +25 vendor frames 

26 artisan:37
Illuminate\Foundation\Console\Kernel::handle()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

Installation failed, reverting ./composer.json to its original content.

Thanks for your help.