We are also sorry to hear such things.
If the data is important, consider contacting a data recovery company for recovery.
In theory, data can be recovered if it is deleted by mistake, as long as you do not format your hard drive or write too much data after that.
So angry with TNAS
Re: So angry with TNAS
To contact our team, please send email to following addresses, remember to replace (at) with @:
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Re: So angry with TNAS
For those who want to attempt data recovery themselves, small learning curve, you can search for "Linux Undelete", and familiarise yourself with those tools. Some NAS can be accessed via SSH, and all the power of Linux commands are then available to you. Good Luck!
UNIX USER 
Broken F2-210 at this time. 
Broken F2-210 at this time.