Yes, it is safe, because:

1. The FastStore Client application operates over a HTTPS connection. HTTPS creates a secure channel and protects from eavesdropping and man-in-the-middle-attacks.
2. Before files leave your computer, they are secured with 2048-bit RSA encryption, which is equal to, or higher than industry standards. In fact, The National Institute of Standards and Technology (NIST) in the USA recommend it's use until 2030!
3. The secured files are transferred encrypted.
4. The files are stored encrypted in a purpose built, state of the art, continuously monitored and guarded data center, certified according to EN ISO 9001:2000.