Hello Francesco,
I use the following:
1. Synology DS713+/DS218+ - All of my customers use this product for housing their application database for many years. DSM, the OS, allows for oplocks to be turned on or off. I employ LetoDBf for the larger installations and standard Samba shares for the others. DS218+ is a better performing version.
2. OpenMediaVault for general business documentation like product artwork, specifications and reports. Oplocks can be adjusted by specifying additional Samba parameters.
Data backups are managed using a product known as Backup Maker.
I hope this information is helpful.
Regards.
Ash