backup-periods.php

<?php

use Carbon\Carbon;
use Carbon\CarbonPeriod;
use Illuminate\Support\Collection;

$period = collect(CarbonPeriod::since(Carbon::parse('-1year'))->days(1)->until(Carbon::now()))
  ->concat(CarbonPeriod::since(Carbon::parse('-1week'))->hours(1)->until(Carbon::now()))
  ->concat(CarbonPeriod::since(Carbon::parse('-1day'))->minutes(30)->until(Carbon::now()));

$backupsPerPeriod = [];

$backupsPerPeriod['daily'] = $period->groupBy(fn (Carbon $date) => $date->format('Ymd'));
$backupsPerPeriod['weekly'] = $period->groupBy(fn (Carbon $date) => $date->format('YW'));
$backupsPerPeriod['monthly'] = $period->groupBy(fn (Carbon $date) => $date->format('Ym'));
$backupsPerPeriod['yearly'] = $period->groupBy(fn (Carbon $date) => $date->format('Y'));

collect($backupsPerPeriod)
  ->map(
    fn(Collection $periods) => $periods
      ->map(
        fn(Collection $backups) => $backups
          ->map->toDateTimeString()
          ->unique()
          ->sortDesc()
          ->values()
      )
      ->sortKeysDesc()
  )
  ->toArray();