Multiple Queries regarding ERPnext implementation

ERPNext
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1

  1. How to backup erpnext data, if attached document also in data. Then how to backup these, how to retrieve backup?

  2. I am going to acquire cloud account on digitaloceanm, what enough configuration I would need for 20users use simultaneously.

  3. How to do customization on codes and incorporate in current erpnext on cloud with same data/setting?

  4. How to update erpnext on cloud/droplet? Will it affect current data/setting?

2
  1. Backup and Restore procedure
    Chech ‘bench backup/restore’ help
  2. ERPNext Customization - YouTube