I have my live sites running on Linux VPS. Now i want to install Django on that. I just want to make sure that will it be safe. Will it interfere in current php sites running with apache.
Any particular file/files i can backup , just in case problem occurs
There is no definitive "Yes" or "No". Its always good to have a backup. If you misconfigure it, yes ist can affect the whole VPS but this is not necessarily the case. There is always the chance that something goes wrong. The question is too generic to give a qualified answer. Try it, if it fails then recover your backup.