The term 'backed up' can be described by the following crossword solutions: Copied (6 letters), Aided (5 letters), ASSISTED (8 letters), Seconded (8 letters), SVD (3 letters), Saved (5 letters), and Testifiedto (11 letters). Copied means to make an exact duplicate of something, while Aided means to give help or support. ASSISTED is similar to Aided, but implies a more active role in providing help. Seconded is to agree with or support someone else's opinion or proposal. SVD stands for Singular Value Decomposition, which is a mathematical technique used to reduce the dimensionality of data. Saved means to keep or preserve something from harm or destruction. Finally, Testifiedto means to provide evidence or testimony in support of something.