You may encrypt your file with the blowfish encryption algorithm. A 128-bit blowfish encryption algorithm is used to protect your data against unauthorized access. Blowfish is a symmetric block cipher that takes a variable-length key, from 32 bits to 448 bits, and is ideal for domestic and exportable use. Blowfish was designed in 1993 by Bruce Schneier as a free alternative to existing encryption algorithms. Since then it has slowly gained popularity as a strong encryption algorithm. This will guarantee additional security of your data. This option is especially useful for remote backup because it helps to prevent hacker attacks.
Novosoft Remote Backup Service - solution for online backup. It protects your backed up data by 128-bit encryption algorithm, synchronizes it and restores.