So that find has the -atime test.

- Backup and restore scripts.
- Run backups weekly, save the last 18 days of backups.
- Store backups in the host's /var/backups.

See:
- https://github.com/nextcloud/server/issues/27085
- https://github.com/nextcloud/server/issues/25436
- https://mariadb.com/kb/en/innodb-compressed-row-format/#read-only